Company lists · Data refreshed September 2026

Top 25 Telecommunications providers based in London, United Kingdom

Name: Telecommunications providers based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 234 companies tracked

RevenueBase identified 234 telecommunications providers headquartered in London, United Kingdom as of September 2026 and tracks 13,458 professional contacts across them, including 4,280 with verified work emails. London is the largest hub.

This list covers telecommunications providers headquartered in London, 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 19, 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 19, 2026 86% judged on-target in blind review

234Companies

13,458Contacts tracked

4,280Verified emails

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The 25 largest telecommunications providers based in London, United Kingdom

Ranked by team size

Top 25 of 234 telecommunications providers based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to telecommunications providers: 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	Vodafone Business	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	10001+	6,767 contacts →
	Indirect evidence “Vodafone Business is part of the Vodafone Group.” Source: RevenueBase Database · checked Sep 19, 2026
2	GAMMA	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,568 contacts →
	Indirect evidence “Gamma Communications is a leading provider of technology-based communication solutions across Europe.” Source: RevenueBase Database · checked Sep 19, 2026
3	Exponential-E	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	667 contacts →
	Indirect evidence “Innovation is at the core of Exponential-e, and has been since our inception in 2002.” Source: RevenueBase Database · checked Sep 19, 2026
4	Monty Mobile	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	514 contacts →
	Indirect evidence “For nearly three decades, Monty Mobile has been at the forefront of global telecom innovation, partnering with mobile operators, enterprises, hyperscalers, and financial…” Source: RevenueBase Database · checked Sep 19, 2026
5	Interoute	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	296 contacts →
	Indirect evidence “Interoute is part of EXA Infrastructure, the largest dedicated digital infrastructure platform connecting Europe and North America, and owns kilometres of fibre network across 34…” Source: RevenueBase Database · checked Sep 19, 2026
6	Spitfire Network Services LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	99 contacts →
	Indirect evidence “Spitfire Network Services is a UK-based, multi-award winning telecoms and ISP provider for businesses.” Source: RevenueBase Database · checked Sep 19, 2026
7	Telappliant	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	67 contacts →
	Indirect evidence “Telappliant is an award-winning VoIP and cloud communications provider.” Source: RevenueBase Database · checked Sep 19, 2026
8	Telecel Global	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	1,001-5,000	62 contacts →
	Strong evidence “Telecel Global is a leading telecommunication company serving the needs of operators and service providers in Africa and across the World.” Source: RevenueBase Database · checked Sep 19, 2026
9	Radiocoms Systems LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	57 contacts →
	Indirect evidence “Radiocoms Systems Limited is a mature communications company of some 50 years and is now the UK’s leading independent communications supplier specialising in the design…” Source: RevenueBase Database · checked Sep 19, 2026
10	Manor Telecom	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	55 contacts →
	Indirect evidence “Manor IT (UK) Limited is an esteemed industry leader, specializing in global wholesale and retail Voice & SMS termination and Communications Platform as a Service (CPaaS).” Source: RevenueBase Database · checked Sep 19, 2026
11	IIJ Europe	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	49 contacts →
	Indirect evidence “We were founded on a culture of engineering excellence and innovation, IIJ is The Backbone of IT for our clients.” Source: RevenueBase Database · checked Sep 19, 2026
12	Voiceflex	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	43 contacts →
	Indirect 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 19, 2026
13	F&w Networks	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	35 contacts →
	Indirect evidence “F&W Networks aims at deploying Fibre to the Premises (FTTP) and FWA systems in multiple locations across the UK to complement existing FTTP rollouts with the ultimate objective of…” Source: RevenueBase Database · checked Sep 19, 2026
14	Zamir Telecom LTD	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	35 contacts →
	Strong evidence “Zamir Telecom Limited (ZTL) is a global leader in providing solutions for Internet and Telecommunication sectors.” Source: RevenueBase Database · checked Sep 19, 2026
15	Your Comms Group	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	33 contacts →
	Indirect evidence “Your Comms Group: Connecting Beyond Words.” Source: RevenueBase Database · checked Sep 19, 2026
16	Avertec	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	33 contacts →
	Indirect evidence “Proudly established in 2007, Avertec provides reliable technology solutions to help businesses stay connected, specialising in business telecoms, business mobile, landlines and…” Source: RevenueBase Database · checked Sep 19, 2026
17	Brdy. Wireless Broadband	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	28 contacts →
	Indirect evidence “Brdy Wireless Broadband – Connecting you to the world At Brdy, our vision is delivering fast broadband connectivity to everyone, anywhere.” Source: RevenueBase Database · checked Sep 19, 2026
18	Universal Call Limited UCL	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	28 contacts →
	Indirect evidence “Our Company: Universal Call is a UK based leading wholesale service provider and is now fast expanding into the global wholesale voice market, leveraging on our accumulated…” Source: RevenueBase Database · checked Sep 19, 2026
19	Active Digital	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	25 contacts →
	Indirect evidence “Powering UK businesses for over 30 years, we’re a leading, award-winning family-run provider of mobile, connectivity, and cloud telecoms solutions.” Source: RevenueBase Database · checked Sep 19, 2026
20	Annecto Telecom	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	23 contacts →
	Indirect evidence “Since 2003, we’ve been making SMS & Voice simple and profitable for our partners.” Source: RevenueBase Database · checked Sep 19, 2026
21	Alfonica	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	19 contacts →
	Indirect evidence “Alfonica is an award-winning provider of innovative connectivity and bespoke business communication solutions, known for delivering excellent customer service to a highly…” Source: RevenueBase Database · checked Sep 19, 2026
22	Qxtel Limited	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	17 contacts →
	Strong evidence “QXTEL is one of the most advanced & diversified Telecommunications & Technology Services Provider focused on Retail & Wholesale Voice Platform Partioning, Wholesale Carrier Voice…” Source: RevenueBase Database · checked Sep 19, 2026
23	Carritech Limited	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	16 contacts →
	Strong evidence “Carritech is a telecommunications company which was founded in 2010 by a management team with over 30 years of experience in the carrier industry.” Source: RevenueBase Database · checked Sep 19, 2026
24	Cortel Telecom	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	15 contacts →
	Strong evidence “Cortel is one of the UK's leading and most experienced telecommunications resellers for businesses.” Source: RevenueBase Database · checked Sep 19, 2026
25	A3&o Limited	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	14 contacts →
	Strong evidence “A3 & O, the leading telecommunication System Integrator and Solution Provider; The company provides state of the art technologies and turnkey solutions to its clients across the…” Source: RevenueBase Database · checked Sep 19, 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: telecommunications providers. 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 telecommunications providers.
Partial evidence: Its own public description names part of telecommunications providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecommunications providers. 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 234 telecommunications providers based in London, United Kingdom

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Telecommunications providers based in London, United Kingdom at a glance

As of Sep 19, 2026

31.8%Verified-email coverage

57.5Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · London

Sep 19, 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 across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 234 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 telecommunications providers, 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 London, United Kingdom whose own description of what they do matches “telecommunications providers”. 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 telecommunications providers), 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 telecommunications providers, and records with no verified work email. Companies headquartered outside London 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, 4,280 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 19, 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.

Telecommunications providers by metro in the United Kingdom

Telecommunications providers in London234
Telecommunications providers in Manchester41
Telecommunications providers in Birmingham31

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 telecommunications providers, 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 telecommunications providers are there based in London, United Kingdom?

RevenueBase identified 234 telecommunications providers headquartered in London, 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?

Vodafone Business, headquartered in London, tops this list with the largest team on record.

Which city has the most telecommunications providers?

London leads with 234 headquartered companies, followed by Manchester (41) and Birmingham (31).

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 4,280 verified decision-maker contacts tracked across these 234 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 19, 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.