Company lists · Data refreshed September 2026

Top 25 Telecom cloud infrastructure software companies based in the United Kingdom

Name: Telecom cloud infrastructure software companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 161 companies tracked

RevenueBase identified 161 telecom cloud infrastructure software companies headquartered in the United Kingdom as of September 2026 and tracks 3,725 professional contacts across them, including 958 with verified work emails. London is the largest hub.

This list covers telecom cloud infrastructure software companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review

161Companies

3,725Contacts tracked

958Verified emails

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The 25 largest telecom cloud infrastructure software companies based in the United Kingdom

Ranked by team size

Top 25 of 161 telecom cloud infrastructure software companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to telecom cloud infrastructure software companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Magdalene	Partial evidence	St Ives, United KingdomHQ checked Sep 29, 2026	201-500	273 contacts →
	Partial evidence “Magdalene provides comprehensive independent solutions which address the individual needs of our customers throughout the Telecommunications Industry.” Source: RevenueBase Database · checked Sep 29, 2026
2	Metaswitch Networks	Strong evidence	Enfield, United KingdomHQ checked Sep 29, 2026	501-1,000	91 contacts →
	Strong evidence “Metaswitch is a recognized leader in the development of ultra-high-performance, cloud native communications software.” Source: RevenueBase Database · checked Sep 29, 2026
3	Bicom Systems	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	90 contacts →
	Indirect evidence “Made for businesses of all sizes, Bicom Systems revolutionizes communications by providing PBXware, the world's most unified turnkey open standards hosted telephony platform, plus…” Source: RevenueBase Database · checked Sep 29, 2026
4	Gradwell	Partial evidence	Bath, United KingdomHQ checked Sep 29, 2026	51-200	85 contacts →
	Partial evidence “Gradwell Communications Ltd are a leading cloud communications solutions provider with a focus on small to medium-sized businesses (SMEs).” Source: RevenueBase Database · checked Sep 29, 2026
5	Telappliant	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	67 contacts →
	Partial evidence “Telappliant is an award-winning VoIP and cloud communications provider.” Source: RevenueBase Database · checked Sep 29, 2026
6	Digitalk	Partial evidence	Milton Keynes, United KingdomHQ checked Sep 29, 2026	51-200	60 contacts →
	Partial evidence “Digitalk, a Hansen Technologies company, enables communications service providers worldwide to operate efficient and innovative services profitably with its Carrier Cloud and…” Source: RevenueBase Database · checked Sep 29, 2026
7	Firstcom Europe LTD	Partial evidence	Bolton, United KingdomHQ checked Sep 29, 2026	51-200	56 contacts →
	Partial evidence “We have over 20 years' experience of working to deliver best of breed cloud telephony solutions to B2B clients.” Source: RevenueBase Database · checked Sep 29, 2026
8	Lifecycle Software	Partial evidence	Newbury, United KingdomHQ checked Sep 29, 2026	11-50	52 contacts →
	Partial evidence “We propel telecoms to innovate fearlessly for the last 30 years.” Source: RevenueBase Database · checked Sep 29, 2026
9	Virtual1	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	44 contacts →
	Partial evidence “At the UK’s most advanced network, we harness innovation, automation and simplicity to provide outstanding wholesale connectivity and cloud services.” Source: RevenueBase Database · checked Sep 29, 2026
10	Voiceflex	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	43 contacts →
	Partial evidence “Voiceflex is an innovative and multi-award-winning wholesale communications provider and leading telecoms carrier of SIP, Hosted Telephony, Connectivity, Unified Communications…” Source: RevenueBase Database · checked Sep 29, 2026
11	Telelink Infra Services UK	Partial evidence	Theale, United KingdomHQ checked Sep 29, 2026	51-200	35 contacts →
	Partial evidence “Telelink provide the critical infrastructure that we all take for granted but has a major impact on our day-to-day life.” Source: RevenueBase Database · checked Sep 29, 2026
12	ONAPP	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	31 contacts →
	Partial evidence “OnApp makes cloud fast, easy & profitable for Telcos, MSPs & other cloud service providers.” Source: RevenueBase Database · checked Sep 29, 2026
13	Eloquent Technologies Limited	Indirect evidence	Stratford Upon Avon, United KingdomHQ checked Sep 29, 2026	11-50	28 contacts →
	Indirect evidence “Eloquent operates a range of platforms across various secure data centres in the UK, all of which are connected to our network and serve as the delivery point for our services.” Source: RevenueBase Database · checked Sep 29, 2026
14	Olive Communications UK	Partial evidence	High Wycombe, United KingdomHQ checked Sep 29, 2026	51-200	28 contacts →
	Partial evidence “Now part of the Onecom Group, Olive and Onecom create the largest business-to-business mobile, fixed-line and cloud specialist in the UK.” Source: RevenueBase Database · checked Sep 29, 2026
15	We ARE Cortex	Indirect evidence	Southampton, United KingdomHQ checked Sep 29, 2026	51-200	26 contacts →
	Indirect evidence “We Are CORTEX are global leaders in advanced automation and orchestration.” Source: RevenueBase Database · checked Sep 29, 2026
16	Ghekko	Partial evidence	Macclesfield, United KingdomHQ checked Sep 29, 2026	11-50	26 contacts →
	Partial evidence “Ghekko is an independent international company providing professional services within the Telecommunications hardware market, with operating offices in EMEA & North America.” Source: RevenueBase Database · checked Sep 29, 2026
17	SCG Wales	Partial evidence	Bridgend, United KingdomHQ checked Sep 29, 2026	11-50	24 contacts →
	Partial evidence “We are a leading telecommunications business with offices based in Bridgend, Bristol and Aberystwyth - covering Wales and South West UK.” Source: RevenueBase Database · checked Sep 29, 2026
18	Voip Unlimited	Strong evidence	Poole, United KingdomHQ checked Sep 29, 2026	11-50	22 contacts →
	Strong evidence “Voip Unlimited has been delivering premium telecoms, cloud, and connectivity solutions since 2006, working hand-in-hand with IT and telecoms partners across the UK.” Source: RevenueBase Database · checked Sep 29, 2026
19	ATOM	Indirect evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 29, 2026	11-50	21 contacts →
	Indirect evidence “At atom.” Source: RevenueBase Database · checked Sep 29, 2026
20	Talk Telecom LTD	Strong evidence	High Wycombe, United KingdomHQ checked Sep 29, 2026	11-50	21 contacts →
	Strong evidence “Talk Telecom Ltd is a leading independent unified telecommunications provider who equips small, medium and large enterprise customers with the telecoms infrastructure required to…” Source: RevenueBase Database · checked Sep 29, 2026
21	Birmingham Telecommunications Limited	Partial evidence	Coleshill, United KingdomHQ checked Sep 29, 2026	11-50	19 contacts →
	Partial evidence “Since 2006, Birmingham Telecom has been helping businesses across the UK with reliable business telecoms, Managed IT Support, Cyber Security and Connectivity Solutions.” Source: RevenueBase Database · checked Sep 29, 2026
22	Airtime Solutions LTD	Strong evidence	Bridgnorth, United KingdomHQ checked Sep 29, 2026	11-50	17 contacts →
	Strong evidence “17 Years of Telecommunications Excellence: Specialising in Cloud-Based Solutions to Keep You Connected to Your Customers and Colleagues Before the 2025 Switch-Off.” Source: RevenueBase Database · checked Sep 29, 2026
23	VTSL	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	15 contacts →
	Partial evidence “VTSL Ltd is a leading cloud communications company in the UK & Ireland.” Source: RevenueBase Database · checked Sep 29, 2026
24	Connectcom Solutions	Indirect evidence	Reading, United KingdomHQ checked Sep 29, 2026	11-50	14 contacts →
	Indirect evidence “At ConnectCom, we are committed to powering the future of connectivity.” Source: RevenueBase Database · checked Sep 29, 2026
25	Voipcloud Wholesale	Partial evidence	Exeter, United KingdomHQ checked Sep 29, 2026	11-50	12 contacts →
	Partial evidence “VoIPcloud Wholesale is a specialist in wholesale cloud telephony platforms and solutions.” Source: RevenueBase Database · checked Sep 29, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: telecom cloud infrastructure software companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names telecom cloud infrastructure software companies.
Partial evidence: Its own public description names part of telecom cloud infrastructure software companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecom cloud infrastructure software companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 161 telecom cloud infrastructure software companies based in the United Kingdom

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Telecom cloud infrastructure software companies based in the United Kingdom at a glance

As of Sep 29, 2026

25.7%Verified-email coverage

23.1Average contacts per company

11-50Median size (employees)

24.8%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 161 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among telecom cloud infrastructure software companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “telecom cloud infrastructure software companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names telecom cloud infrastructure software companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among telecom cloud infrastructure software companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 958 across the full list. 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 29, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Telecom cloud infrastructure software companies by metro

Telecom cloud infrastructure software companies in London40

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names telecom cloud infrastructure software companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many telecom cloud infrastructure software companies are there based in the United Kingdom?

RevenueBase identified 161 telecom cloud infrastructure software companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Magdalene, headquartered in United Kingdom, tops this list with the largest team on record.

Which city has the most telecom cloud infrastructure software companies?

London leads with 40 headquartered companies, followed by Reading (5) and Bolton (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 958 verified decision-maker contacts tracked across these 161 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 2026.

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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 Smart Search, 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.