Company lists · Data refreshed September 2026

Top 25 Telecom software developers based in the United Kingdom

Name: Telecom software developers 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 97 companies tracked

RevenueBase identified 97 telecom software developers headquartered in the United Kingdom as of September 2026 and tracks 2,552 professional contacts across them, including 658 with verified work emails. London is the largest hub.

This list covers telecom software developers 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

97Companies

2,552Contacts tracked

658Verified emails

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The 25 largest telecom software developers based in the United Kingdom

Ranked by team size

Top 25 of 97 telecom software developers 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 software developers: 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	Cerillion Technologies	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	364 contacts →
	Strong evidence “Cerillion is a leading provider of BSS/OSS software for the telecommunications industry, with over 25 years’ experience supporting mobile, fixed, cable and multi-service operators…” Source: RevenueBase Database · checked Sep 29, 2026
2	Omobiong	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	168 contacts →
	Strong evidence “Omobio (Pvt) Ltd was established in February 2011 by a team of Professional Telecom Software Developers, tendering it’s service to Telecom Operators and Telecom Service…” Source: RevenueBase Database · checked Sep 29, 2026
3	Telesens	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	125 contacts →
	Strong evidence “Telesens is a global provider of enterprise level cost effective software products and solutions for telecom and other business domains.” Source: RevenueBase Database · checked Sep 29, 2026
4	MDS Global	Indirect evidence	Warrington, United KingdomHQ checked Sep 29, 2026	201-500	113 contacts →
	Indirect evidence “MDS Global powers digital telcos for revenue growth, customer delight, and cost reduction.” Source: RevenueBase Database · checked Sep 29, 2026
5	Barclay Communications	Indirect evidence	Belfast, United KingdomHQ checked Sep 29, 2026	51-200	98 contacts →
	Indirect evidence “Barclay Communications is the leading provider of business mobile, landline and digital solutions, supporting small, medium and large organisations across the UK.” Source: RevenueBase Database · checked Sep 29, 2026
6	Programus LTD	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	95 contacts →
	Strong evidence “Programus Limited boast over 15 years of experience developing the world's leading software for the Telecom and Events and Venues industries.” Source: RevenueBase Database · checked Sep 29, 2026
7	Usha Martin Technologies	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	64 contacts →
	Indirect evidence “Usha Martin Technologies (UMT) is the technology services arm of the Usha Martin Group, a business conglomerate.” 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	Call Systems Technology Limited	Partial evidence	Elstree, United KingdomHQ checked Sep 29, 2026	11-50	47 contacts →
	Partial evidence “Call Systems Technology Ltd (CST) specialises in innovative communication technology and software solutions for organisation across a wide range of sectors, including hospitality…” Source: RevenueBase Database · checked Sep 29, 2026
10	SKO Systems	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	45 contacts →
	Partial evidence “At SKO Systems, we engineer enterprise-grade software ecosystems designed for the unique, high-stakes realities of the maritime environment.” Source: RevenueBase Database · checked Sep 29, 2026
11	Crown Interactive Limited	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	39 contacts →
	Partial evidence “Crown Interactive is a technology Software Solution Company with its head office in Lagos, Nigeria.” Source: RevenueBase Database · checked Sep 29, 2026
12	Tekton Billing	Partial evidence	Caterham, United KingdomHQ checked Sep 29, 2026	11-50	38 contacts →
	Partial evidence “Tekton Billing develops software that helps service providers simplify, automate and scale.” Source: RevenueBase Database · checked Sep 29, 2026
13	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
14	Nexum Software	Indirect evidence	Croydon, United KingdomHQ checked Sep 29, 2026	51-200	19 contacts →
	Indirect evidence “CHANGING TECHNOLOGIES At NEXUM we adopt an open mind to product and commercial strategy.” Source: RevenueBase Database · checked Sep 29, 2026
15	Jerasoft	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	18 contacts →
	Strong evidence “JeraSoft is a leading developer and integrator of full-featured Billing Software for modern Telecom Operators (VoIP) and IoT/M2M Providers.” Source: RevenueBase Database · checked Sep 29, 2026
16	Mobihive Labs Limited	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	15 contacts →
	Indirect evidence “A hardcore IT Organisation, we have moved away from traditional office locations to ensure we are completely flexible and easily available to solve your problems as quickly as…” Source: RevenueBase Database · checked Sep 29, 2026
17	Frame Communications	Partial evidence	Newmarket, United KingdomHQ checked Sep 29, 2026	11-50	13 contacts →
	Partial evidence “Frame Communications Ltd supplies a wide range of Telecoms Datacoms Test and Management solutions to Network Operators, Equipment Manufacturers, System Integrators, Field Support…” Source: RevenueBase Database · checked Sep 29, 2026
18	MIT Dynamic	Partial evidence	Margaretting, United KingdomHQ checked Sep 29, 2026	11-50	12 contacts →
	Partial evidence “We are a UK-based development company specialising in data capture and communication software solutions.” Source: RevenueBase Database · checked Sep 29, 2026
19	Atereo	Indirect evidence	Wallington, United KingdomHQ checked Sep 29, 2026	11-50	11 contacts →
	Indirect evidence “We provide communications apps (directory, information, messaging), speech recognition auto attendants, integrated call handling solutions, operator consoles, contact centres…” Source: RevenueBase Database · checked Sep 29, 2026
20	Cleartech Communications LTD	Partial evidence	Bolton, United KingdomHQ checked Sep 29, 2026	11-50	10 contacts →
	Partial evidence “At ClearTech Communications, we specialise in providing market-leading hardware, advanced systems, and intuitive software to build a robust and resilient communication…” Source: RevenueBase Database · checked Sep 29, 2026
21	KEIMA	Partial evidence	Cardiff, United KingdomHQ checked Sep 29, 2026	11-50	10 contacts →
	Partial evidence “Keima supplies software engineering solutions to the wireless industry.” Source: RevenueBase Database · checked Sep 29, 2026
22	Salestar	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	10 contacts →
	Strong evidence “With over 20 years of experience, salestar continues to lead the way in delivering software solutions specifically designed for the telecom, mobile phone, and cellular industries.” Source: RevenueBase Database · checked Sep 29, 2026
23	Sysmech	Indirect evidence	Whitstable, United KingdomHQ checked Sep 29, 2026	11-50	10 contacts →
	Indirect evidence “In today’s increasingly complex Networks, IT infrastructure and Services, business critical operations cannot rely on Human Intelligence alone.” Source: RevenueBase Database · checked Sep 29, 2026
24	Business NET Solutions LTD	Indirect evidence	Milton Keynes, United KingdomHQ checked Sep 29, 2026	1-10	7 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026
25	Symbiosys Business Solutions	Partial evidence	Congleton, United KingdomHQ checked Sep 29, 2026	1-10	7 contacts →
	Partial evidence “Symbiosys Business Solutions specialise in the development of custom and packaged software solutions underpinned by a consultative approach that ensures the delivery of the most…” 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 software developers. 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 software developers.
Partial evidence: Its own public description names part of telecom software developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecom software developers. 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 97 telecom software developers based in the United Kingdom

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Telecom software developers based in the United Kingdom at a glance

As of Sep 29, 2026

25.8%Verified-email coverage

26.3Average contacts per company

11-50Median size (employees)

35.1%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 97 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 software developers, 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 software developers”. 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 software developers), 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 software developers, 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, 658 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 software developers by metro

Telecom software developers in London34

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 software developers, 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 software developers are there based in the United Kingdom?

RevenueBase identified 97 telecom software developers 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?

Cerillion Technologies, headquartered in London, tops this list with the largest team on record.

Which city has the most telecom software developers?

London leads with 34 headquartered companies, followed by Belfast (2) and Birmingham (2).

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 658 verified decision-maker contacts tracked across these 97 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.