Company lists · Data refreshed September 2026
Top 25 Calling companies worldwide
RevenueBase identified 7,651 company matches for calling companies worldwide as of September 2026 and tracks 146,623 professional contacts across them, including 28,839 with verified work emails. The United States is the largest market and London the largest hub.
This list covers company matches for calling companies worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 21, 2026. Country and city lists for calling companies follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest calling companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 12,790 contacts → | ||||
Exact match “Turkcell is a converged telecommunication and technology services provider, founded and headquartered in Türkiye.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 2 | 7,275 contacts → | ||||
Exact match “Windstream and Uniti have merged - Please follow us at Uniti Group, Inc.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 3 | 6,767 contacts → | ||||
Exact match “Vodafone Business is part of the Vodafone Group.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 4 | 6,379 contacts → | ||||
Exact match “Cable One Business offers scalable, reliable, and efficient solutions so that the businesses we serve can be successful.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 5 | 3,044 contacts → | ||||
Exact match “Our story starts with understanding that connectivity powers everything you do, and we make it stronger.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 6 | 2,760 contacts → | ||||
Exact match “The B2B arm of Bharti Airtel, we are India's leading provider of secure and reliable connectivity, technology, and communications solutions.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 7 | 2,270 contacts → | ||||
Exact match “Granite is a dynamic and rapidly growing company serving the exciting and demanding Telecommunications market.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 8 | 1,807 contacts → | ||||
Exact match “Somos uma empresa de telecomunicações com 28 anos de atuação.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 9 | 1,733 contacts → | ||||
Exact match “Com mais de funcionários, a Ability Tecnologia e Serviços S.A.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 10 | 1,568 contacts → | ||||
Exact match “Gamma Communications is a leading provider of technology-based communication solutions across Europe.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 11 | 1,220 contacts → | ||||
Exact match “TTCL Corporation is a Tanzania's leading integrated communications Corporation, with a comprehensive portfolio of products and services including local, national and international…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 12 | 1,133 contacts → | ||||
Exact match “Integra is Allstream.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 13 | 1,001 contacts → | ||||
Exact match “A Sercomtel é a empresa paranaense de telecomunicações que oferece soluções completas em telefonia.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 14 | 890 contacts → | ||||
Exact match “Multinet Pakistan is one of the premier information and communication solution providers for leading enterprises in the region.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 15 | 819 contacts → | ||||
Exact match “Com mais de 25 anos de experiência, a Mundivox é uma operadora licenciada pela Anatel, especializada em soluções integradas de comunicação para o mercado corporativo.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 16 | 777 contacts → | ||||
Exact match “Data Transmission company of Asiatech (#asiatech) was established in 2003 to provide IT-based services and obtained PAP license from the Communications Regulatory Authority (CRA)…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 17 | 691 contacts → | ||||
Exact match “ShoreTel is now part of Mitel.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 18 | 655 contacts → | ||||
Exact match “Onecom is the UK’s leading business telecoms and cloud communications provider managing over a million services for business customers - delivering communication services and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 19 | 606 contacts → | ||||
Exact match “Ooma delivers phone, messaging, video and advanced communications services that are easy to implement and provide great value.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 20 | 542 contacts → | ||||
Exact match “TelePacific company is now TPx Communications.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 21 | 527 contacts → | ||||
Exact match “Telecom Applications are one of the fastest-changing technologies of today.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 22 | 518 contacts → | ||||
Exact match “A DDS é uma empresa de tecnologia especializada na integração de sistemas.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 23 | 507 contacts → | ||||
Exact match “Somos C3NTRO, una empresa mexicana de clase mundial con 15 años de experiencia en Telecomunicaciones.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 24 | 454 contacts → | ||||
Exact match “Sangoma Technologies Corporation (TSX: STC; Nasdaq: SANG) is a global leader in essential business communications.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
| 25 | 435 contacts → | ||||
Exact match “NHC is THE communications STACK provider™.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “calling companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 7,651 calling companies worldwide
See the full list, filter by size, metro and specialty, and access 28,839 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Calling companies worldwide at a glance
As of Sep 21, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for calling companies are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “calling companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every displayed company carries at least one verified work email. RevenueBase tracks 28,839 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Calling companies by location
30 lists · largest firstEvery Calling companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Calling companies based in the United States1,952
- Calling companies based in the United Kingdom870
- Calling companies based in Brazil525
- Calling companies based in Canada294
- Calling companies based in France275
- Calling companies based in Germany228
- Calling companies based in Australia225
- Calling companies based in Spain223
- Calling companies based in Italy203
- Calling companies based in India173
- Calling companies based in the Netherlands163
- Calling companies based in South Africa111
- Calling companies based in Mexico90
- Calling companies based in Sweden62
- Calling companies based in Türkiye60
- Calling companies based in Belgium54
- Calling companies based in Colombia42
- Calling companies based in Poland40
- Calling companies based in the United Arab Emirates40
- Calling companies based in Argentina39
- Calling companies based in Switzerland31
- Calling companies based in Greece29
- Calling companies based in New Zealand29
- Calling companies based in Portugal28
- Calling companies based in Austria26
- Calling companies based in Chile26
Cities
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “calling companies”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many calling companies are there worldwide?
RevenueBase identified 7,651 company matches for calling companies worldwide as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Turkcell tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most calling companies?
The United States leads with 1,952 companies, followed by the United Kingdom (870) and Brazil (525). Every calling companies list by country and city is linked on this page.
Which city has the most calling companies?
London leads with 122 company records, followed by Sao Paulo (119) and New York (59).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 28,839 professional contacts with verified work emails tracked across these 7,651 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.
Ready to reach these companies? Verified emails and direct dials for all 7,651 calling companies worldwide. Start with a free account, no credit card.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
Company intelligence · public preview
Top 25 calling companies worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 7,651 matching company records for calling companies worldwide, with 146,623 tracked contacts and 28,839 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 21, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 calling companies worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Turkcellturkcell.com.tr HQ: Istanbul, TürkiyeReported employees: 5,001-10,000 | Istanbul, Türkiye | 5,001-10,000 | Exact match | 12,790 contacts → |
“Turkcell is a converged telecommunication and technology services provider, founded and headquartered in Türkiye.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Windstreamuniti.comHQ: Little Rock, AR, United StatesReported employees: 10001+ | Little Rock, AR, United States | 10001+ | Exact match | 7,275 contacts → |
“Windstream and Uniti have merged - Please follow us at Uniti Group, Inc.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Vodafone Businessvodafone.comHQ: London, United KingdomReported employees: 10001+ | London, United Kingdom | 10001+ | Exact match | 6,767 contacts → |
“Vodafone Business is part of the Vodafone Group.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Cable ONEcableone.net HQ: Phoenix, AZ, United StatesReported employees: 1,001-5,000 | Phoenix, AZ, United States | 1,001-5,000 | Exact match | 6,379 contacts → |
“Cable One Business offers scalable, reliable, and efficient solutions so that the businesses we serve can be successful.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Spectrum Businessspectrum.comHQ: Stamford, CT, United StatesReported employees: 10001+ | Stamford, CT, United States | 10001+ | Exact match | 3,044 contacts → |
“Our story starts with understanding that connectivity powers everything you do, and we make it stronger.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Airtel Businessairtel.inHQ: Gurgaon, IndiaReported employees: 10001+ | Gurgaon, India | 10001+ | Exact match | 2,760 contacts → |
“The B2B arm of Bharti Airtel, we are India's leading provider of secure and reliable connectivity, technology, and communications solutions.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Granite Telecommunicationsgranitenet.comHQ: Quincy, MA, United StatesReported employees: 1,001-5,000 | Quincy, MA, United States | 1,001-5,000 | Exact match | 2,270 contacts → |
“Granite is a dynamic and rapidly growing company serving the exciting and demanding Telecommunications market.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Unifiqueunifique.com.brHQ: Timbó, BrazilReported employees: 1,001-5,000 | Timbó, Brazil | 1,001-5,000 | Exact match | 1,807 contacts → |
“Somos uma empresa de telecomunicações com 28 anos de atuação.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Ability Tecnologia E Serviços S Aabilitytecnologia.com.brHQ: Osasco, BrazilReported employees: 1,001-5,000 | Osasco, Brazil | 1,001-5,000 | Exact match | 1,733 contacts → |
“Com mais de funcionários, a Ability Tecnologia e Serviços S.A.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  GAMMAgammagroup.coHQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 1,568 contacts → |
“Gamma Communications is a leading provider of technology-based communication solutions across Europe.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Tanzania Telecommunications Corporationttcl.co.tz HQ: Dar Es Salaam, TanzaniaReported employees: 1,001-5,000 | Dar Es Salaam, Tanzania | 1,001-5,000 | Exact match | 1,220 contacts → |
“TTCL Corporation is a Tanzania's leading integrated communications Corporation, with a comprehensive portfolio of products and services including local, national and international…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Integraallstream.comHQ: Vancouver, WA, United StatesReported employees: 501-1,000 | Vancouver, WA, United States | 501-1,000 | Exact match | 1,133 contacts → |
“Integra is Allstream.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Sercomtelsercomtel.com.brHQ: Londrina, BrazilReported employees: 501-1,000 | Londrina, Brazil | 501-1,000 | Exact match | 1,001 contacts → |
“A Sercomtel é a empresa paranaense de telecomunicações que oferece soluções completas em telefonia.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Multinet Pakistan Private Limitedmultinet.com.pkHQ: Karachi, PakistanReported employees: 1,001-5,000 | Karachi, Pakistan | 1,001-5,000 | Exact match | 890 contacts → |
“Multinet Pakistan is one of the premier information and communication solution providers for leading enterprises in the region.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Mundivox Communicationsmundivox.comHQ: São Paulo, BrazilReported employees: 501-1,000 | São Paulo, Brazil | 501-1,000 | Exact match | 819 contacts → |
“Com mais de 25 anos de experiência, a Mundivox é uma operadora licenciada pela Anatel, especializada em soluções integradas de comunicação para o mercado corporativo.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Asiatech COasiatech.irHQ: Tehran, IranReported employees: 501-1,000 | Tehran, Iran | 501-1,000 | Exact match | 777 contacts → |
“Data Transmission company of Asiatech (#asiatech) was established in 2003 to provide IT-based services and obtained PAP license from the Communications Regulatory Authority (CRA)…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Shoretelmitel.comHQ: Kanata, CanadaReported employees: 1,001-5,000 | Kanata, Canada | 1,001-5,000 | Exact match | 691 contacts → |
“ShoreTel is now part of Mitel.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Onecomonecom.co.ukHQ: Fareham, United KingdomReported employees: 501-1,000 | Fareham, United Kingdom | 501-1,000 | Exact match | 655 contacts → |
“Onecom is the UK’s leading business telecoms and cloud communications provider managing over a million services for business customers - delivering communication services and…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  Ooma, INCooma.comHQ: Sunnyvale, CA, United StatesReported employees: 501-1,000 | Sunnyvale, CA, United States | 501-1,000 | Exact match | 606 contacts → |
“Ooma delivers phone, messaging, video and advanced communications services that are easy to implement and provide great value.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | HQ: Los Angeles, CA, United StatesReported employees: 1,001-5,000 | Los Angeles, CA, United States | 1,001-5,000 | Exact match | 542 contacts → |
“TelePacific company is now TPx Communications.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Deepija Telecom PVT LTDdeepijatel.comHQ: Hyderabad, IndiaReported employees: 201-500 | Hyderabad, India | 201-500 | Exact match | 527 contacts → |
“Telecom Applications are one of the fastest-changing technologies of today.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  DDS Telecomunicações Ltdadds.com.brHQ: São Paulo, BrazilReported employees: 51-200 | São Paulo, Brazil | 51-200 | Exact match | 518 contacts → |
“A DDS é uma empresa de tecnologia especializada na integração de sistemas.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  C3ntro Telecomc3ntro.comHQ: Miguel Hidalgo, MexicoReported employees: 501-1,000 | Miguel Hidalgo, Mexico | 501-1,000 | Exact match | 507 contacts → |
“Somos C3NTRO, una empresa mexicana de clase mundial con 15 años de experiencia en Telecomunicaciones.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Sangomasangoma.comHQ: Markham, ON, CanadaReported employees: 201-500 | Markham, ON, Canada | 201-500 | Exact match | 454 contacts → |
“Sangoma Technologies Corporation (TSX: STC; Nasdaq: SANG) is a global leader in essential business communications.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | NEW Horizon Communicationsnhcgrp.com HQ: Concord, MA, United StatesReported employees: 51-200 | Concord, MA, United States | 51-200 | Exact match | 435 contacts → |
“NHC is THE communications STACK provider™.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 7,651 company matches
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Calling companies: dataset insights
September 21, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
7,627 records in the displayed employee bands.
24 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 7,651 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 21, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Calling companies by location
30 lists · largest firstEvery Calling companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Calling companies based in the United States1,952
- Calling companies based in the United Kingdom870
- Calling companies based in Brazil525
- Calling companies based in Canada294
- Calling companies based in France275
- Calling companies based in Germany228
- Calling companies based in Australia225
- Calling companies based in Spain223
- Calling companies based in Italy203
- Calling companies based in India173
- Calling companies based in the Netherlands163
- Calling companies based in South Africa111
- Calling companies based in Mexico90
- Calling companies based in Sweden62
- Calling companies based in Türkiye60
- Calling companies based in Belgium54
- Calling companies based in Colombia42
- Calling companies based in Poland40
- Calling companies based in the United Arab Emirates40
- Calling companies based in Argentina39
- Calling companies based in Switzerland31
- Calling companies based in Greece29
- Calling companies based in New Zealand29
- Calling companies based in Portugal28
- Calling companies based in Austria26
- Calling companies based in Chile26
Cities
Questions about this company list
What does Exact match mean for calling companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many calling companies did RevenueBase find worldwide?
The saved snapshot records 7,651 matching company records, 146,623 tracked contacts and 28,839 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 21, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Browse the directory
Cite this list
RevenueBase Data Team. Top 25 calling companies worldwide. Snapshot: September 21, 2026. https://revenuebase.ai/companies/browse/calling-companies.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 calling companies worldwide
RevenueBase records 7,651 matching company records for calling companies worldwide, with 146,623 tracked contacts and 28,839 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 21, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 calling companies worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Turkcellturkcell.com.tr HQ: Istanbul, TürkiyeReported employees: 5,001-10,000 | Istanbul, Türkiye | 5,001-10,000 | Exact match | 12,790 contacts → |
“Turkcell is a converged telecommunication and technology services provider, founded and headquartered in Türkiye.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Windstreamuniti.com HQ: Little Rock, AR, United StatesReported employees: 10001+ | Little Rock, AR, United States | 10001+ | Exact match | 7,275 contacts → |
“Windstream and Uniti have merged - Please follow us at Uniti Group, Inc.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Vodafone Businessvodafone.com HQ: London, United KingdomReported employees: 10001+ | London, United Kingdom | 10001+ | Exact match | 6,767 contacts → |
“Vodafone Business is part of the Vodafone Group.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Cable ONEcableone.net HQ: Phoenix, AZ, United StatesReported employees: 1,001-5,000 | Phoenix, AZ, United States | 1,001-5,000 | Exact match | 6,379 contacts → |
“Cable One Business offers scalable, reliable, and efficient solutions so that the businesses we serve can be successful.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Spectrum Businessspectrum.com HQ: Stamford, CT, United StatesReported employees: 10001+ | Stamford, CT, United States | 10001+ | Exact match | 3,044 contacts → |
“Our story starts with understanding that connectivity powers everything you do, and we make it stronger.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Airtel Businessairtel.in HQ: Gurgaon, IndiaReported employees: 10001+ | Gurgaon, India | 10001+ | Exact match | 2,760 contacts → |
“The B2B arm of Bharti Airtel, we are India's leading provider of secure and reliable connectivity, technology, and communications solutions.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Granite Telecommunicationsgranitenet.com HQ: Quincy, MA, United StatesReported employees: 1,001-5,000 | Quincy, MA, United States | 1,001-5,000 | Exact match | 2,270 contacts → |
“Granite is a dynamic and rapidly growing company serving the exciting and demanding Telecommunications market.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Unifiqueunifique.com.br HQ: Timbó, BrazilReported employees: 1,001-5,000 | Timbó, Brazil | 1,001-5,000 | Exact match | 1,807 contacts → |
“Somos uma empresa de telecomunicações com 28 anos de atuação.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Ability Tecnologia E Serviços S Aabilitytecnologia.com.br HQ: Osasco, BrazilReported employees: 1,001-5,000 | Osasco, Brazil | 1,001-5,000 | Exact match | 1,733 contacts → |
“Com mais de funcionários, a Ability Tecnologia e Serviços S.A.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | GAMMAgammagroup.co HQ: London, United KingdomReported employees: 1,001-5,000 | London, United Kingdom | 1,001-5,000 | Exact match | 1,568 contacts → |
“Gamma Communications is a leading provider of technology-based communication solutions across Europe.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Tanzania Telecommunications Corporationttcl.co.tz HQ: Dar Es Salaam, TanzaniaReported employees: 1,001-5,000 | Dar Es Salaam, Tanzania | 1,001-5,000 | Exact match | 1,220 contacts → |
“TTCL Corporation is a Tanzania's leading integrated communications Corporation, with a comprehensive portfolio of products and services including local, national and international…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Integraallstream.com HQ: Vancouver, WA, United StatesReported employees: 501-1,000 | Vancouver, WA, United States | 501-1,000 | Exact match | 1,133 contacts → |
“Integra is Allstream.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Sercomtelsercomtel.com.br HQ: Londrina, BrazilReported employees: 501-1,000 | Londrina, Brazil | 501-1,000 | Exact match | 1,001 contacts → |
“A Sercomtel é a empresa paranaense de telecomunicações que oferece soluções completas em telefonia.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Multinet Pakistan Private Limitedmultinet.com.pk HQ: Karachi, PakistanReported employees: 1,001-5,000 | Karachi, Pakistan | 1,001-5,000 | Exact match | 890 contacts → |
“Multinet Pakistan is one of the premier information and communication solution providers for leading enterprises in the region.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Mundivox Communicationsmundivox.com HQ: São Paulo, BrazilReported employees: 501-1,000 | São Paulo, Brazil | 501-1,000 | Exact match | 819 contacts → |
“Com mais de 25 anos de experiência, a Mundivox é uma operadora licenciada pela Anatel, especializada em soluções integradas de comunicação para o mercado corporativo.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Asiatech COasiatech.ir HQ: Tehran, IranReported employees: 501-1,000 | Tehran, Iran | 501-1,000 | Exact match | 777 contacts → |
“Data Transmission company of Asiatech (#asiatech) was established in 2003 to provide IT-based services and obtained PAP license from the Communications Regulatory Authority (CRA)…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Shoretelmitel.com HQ: Kanata, CanadaReported employees: 1,001-5,000 | Kanata, Canada | 1,001-5,000 | Exact match | 691 contacts → |
“ShoreTel is now part of Mitel.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Onecomonecom.co.uk HQ: Fareham, United KingdomReported employees: 501-1,000 | Fareham, United Kingdom | 501-1,000 | Exact match | 655 contacts → |
“Onecom is the UK’s leading business telecoms and cloud communications provider managing over a million services for business customers - delivering communication services and…” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Ooma, INCooma.com HQ: Sunnyvale, CA, United StatesReported employees: 501-1,000 | Sunnyvale, CA, United States | 501-1,000 | Exact match | 606 contacts → |
“Ooma delivers phone, messaging, video and advanced communications services that are easy to implement and provide great value.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | HQ: Los Angeles, CA, United StatesReported employees: 1,001-5,000 | Los Angeles, CA, United States | 1,001-5,000 | Exact match | 542 contacts → |
“TelePacific company is now TPx Communications.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Deepija Telecom PVT LTDdeepijatel.com HQ: Hyderabad, IndiaReported employees: 201-500 | Hyderabad, India | 201-500 | Exact match | 527 contacts → |
“Telecom Applications are one of the fastest-changing technologies of today.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | DDS Telecomunicações Ltdadds.com.br HQ: São Paulo, BrazilReported employees: 51-200 | São Paulo, Brazil | 51-200 | Exact match | 518 contacts → |
“A DDS é uma empresa de tecnologia especializada na integração de sistemas.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | C3ntro Telecomc3ntro.com HQ: Miguel Hidalgo, MexicoReported employees: 501-1,000 | Miguel Hidalgo, Mexico | 501-1,000 | Exact match | 507 contacts → |
“Somos C3NTRO, una empresa mexicana de clase mundial con 15 años de experiencia en Telecomunicaciones.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Sangomasangoma.com HQ: Markham, ON, CanadaReported employees: 201-500 | Markham, ON, Canada | 201-500 | Exact match | 454 contacts → |
“Sangoma Technologies Corporation (TSX: STC; Nasdaq: SANG) is a global leader in essential business communications.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | NEW Horizon Communicationsnhcgrp.com HQ: Concord, MA, United StatesReported employees: 51-200 | Concord, MA, United States | 51-200 | Exact match | 435 contacts → |
“NHC is THE communications STACK provider™.” Recorded description excerpt · September 21, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 7,651 company matches
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Calling companies: dataset insights
September 21, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
7,627 records in the displayed employee bands.
24 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 7,651 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 21, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Calling companies by location
30 lists · largest firstEvery Calling companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Calling companies based in the United States1,952
- Calling companies based in the United Kingdom870
- Calling companies based in Brazil525
- Calling companies based in Canada294
- Calling companies based in France275
- Calling companies based in Germany228
- Calling companies based in Australia225
- Calling companies based in Spain223
- Calling companies based in Italy203
- Calling companies based in India173
- Calling companies based in the Netherlands163
- Calling companies based in South Africa111
- Calling companies based in Mexico90
- Calling companies based in Sweden62
- Calling companies based in Türkiye60
- Calling companies based in Belgium54
- Calling companies based in Colombia42
- Calling companies based in Poland40
- Calling companies based in the United Arab Emirates40
- Calling companies based in Argentina39
- Calling companies based in Switzerland31
- Calling companies based in Greece29
- Calling companies based in New Zealand29
- Calling companies based in Portugal28
- Calling companies based in Austria26
- Calling companies based in Chile26
Cities
Questions about this company list
What does Exact match mean for calling companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many calling companies did RevenueBase find worldwide?
The saved snapshot records 7,651 matching company records, 146,623 tracked contacts and 28,839 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 21, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 calling companies worldwide. Snapshot: September 21, 2026. https://revenuebase.ai/companies/browse/calling-companies.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗