Company lists · Data verified August 2026

Top 25 Cloud pbx companies based in the United Kingdom

Name: Cloud pbx companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 220 companies tracked

There are 220 cloud pbx companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 1,785 professional contacts across them, including 628 with verified work emails and 200 with mobile numbers. London is the largest hub.

This list covers cloud pbx 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. Data current as of August 28, 2026.

220Companies

1,785Contacts tracked

628Verified emails

200Mobile numbers

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The 25 largest cloud pbx companies based in the United Kingdom

Ranked by team size

Top 25 of 220 cloud pbx companies based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Calltower	London	201-500	226	128
2	Bonline	London	51-200	172	41
3	Gradwell	West Bath	51-200	85	43
4	Sipcom	London	501-1,000	84	28
5	Telappliant	Manchester	51-200	67	44
6	Firstcom Europe LTD	Bolton	51-200	55	40
7	Microtalk	London	11-50	44	9
8	Lister Unified Communications	Stonehouse	11-50	32	16
9	Voicemailtel	Haslemere	51-200	29	8
10	Mainstream Digital	Cirencester	11-50	24	15
11	Wavetel Business LTD	London	51-200	21	8
12	Birmingham Telecommunications Limited	Coleshill	11-50	19	10
13	Voipstudio	London	51-200	17	4
14	VTSL	London	11-50	15	9
15	Elementel LTD	Romsey	11-50	15	9
16	Fusion Communications	Lichfield	11-50	15	5
17	Splicecom LTD	Chorleywood	51-200	13	5
18	SCG Wholesale	Basingstoke	11-50	13	1
19	The Voip Shop	Leicester	11-50	12	9
20	IP Office LTD	Exeter	11-50	12	4
21	Blue Portal Group	Barnsley	11-50	11	7
22	Boom Coms Limited	Basingstoke	11-50	10	9
23	In2tel, An 8x8 Communications Company	Telford	11-50	10	7
24	The Real PBX	Snodland	11-50	10	1
25	BDM Voice	Burgess Hill	11-50	9	2

Showing 25 of 220 cloud pbx companies based in the United Kingdom

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Cloud pbx companies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 46 HQs

200Contacts with mobile numbers

2Emails re-verified in last 30 days

Companies by employee count

1-10

111

11-50

51-200

201-500

501-1,000

Cloud pbx companies by metro

Metro	Companies
Cloud pbx companies in London	46
Cloud pbx companies in Manchester	7
Cloud pbx companies in Leeds	4
Cloud pbx companies in Exeter	3
Cloud pbx companies in Ilford	3
Cloud pbx companies in Southampton	3
Cloud pbx companies in Birmingham	3

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cloud pbx companies”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 2 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many cloud pbx companies are there based in the United Kingdom?

There are 220 cloud pbx companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

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

Which city has the most cloud pbx companies?

London leads with 46 headquartered companies, followed by Manchester (7) and Leeds (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 628 verified decision-maker contacts tracked across these 220 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.