UK SIC 2007 · 61900
Other telecommunications activities (SIC code 61900)
Other telecommunications activities is UK SIC code 61900. It sits in division 61 (Telecommunications) of the SIC 2007 list. On the August 2026 Companies House register, 11,300 active UK companies list 61900 among their SIC codes. 8,635 of them list it first. That makes it the most used code in its division.
Division 61: Telecommunications
Division 61 is for companies that carry voice and data. Infrastructure is what separates the codes. Operators of wired, fixed-line networks use 61100. Wireless and mobile operators use 61200. Everything else falls into 61900, easily the most registered of the three. That includes VoIP providers, telecoms resellers, airtime dealers and internet service providers running on wholesale networks they do not own. The shape matches the real UK market. A handful of network owners sit under a long tail of channel partners and resellers, and the long tail fills the register.
Related SIC codes
Who prospects SIC 61900 companies
Most companies here resell capacity. So the wholesale carriers and their distributors sell into this division all the time, competing to sign channel partners. Billing platform vendors, number porting and provisioning services and comms recruiters follow close behind. Accountants target the many small resellers built on recurring commission. A new 61900 company is often a salesperson who has left an employer to start a dealership. Supplier agreements get signed in those first weeks, so early contact wins. Growth in filed accounts usually means a bigger customer base, with more interconnect and billing to handle.
Lead generation for founders & owners →How to read SIC 61900
SIC 61900 is a five-digit code, and the digits are not arbitrary. The first two, 61, are the division, telecommunications. Add the third and you have group 619; the fourth narrows it to a class, and the fifth to the subclass, which is the level Companies House actually asks a company to pick. The whole division sits under section J, information and communication, the broadest tier there is. Reading a code left to right therefore goes from a whole sector down to one activity.
A company chooses its own codes when it incorporates and can change them on any confirmation statement. It may list up to four, and Companies House does not check whether they are right. That is why 61900 is worth reading as a claim the company made about itself rather than as a verified fact, and why the first-position and any-position counts above differ.
Measured on the August 2026 register, the busiest registered-office post towns for 61900 are London (2,543), Manchester (199), Birmingham (178), Glasgow (137) and Liverpool (136). Those are registered-office locations, which is where the paperwork sits rather than necessarily where the work happens, so treat them as where to start looking rather than as a service area.
Using SIC 61900 as a filter
11,300 companies is 0.22 per cent of the 5,190,464 active companies on the UK register, and ranks 61900 most used of the 4 codes we track in division 61. That is the pool before any filter. Whether it is a big market for you depends on what you sell, but it is the number every other filter on this page cuts down from.
8,635 companies put 61900 first and a further 2,665, 24 per cent, list it in one of their other three SIC slots. That gap is the difference between a tight list and a broad one. First-code-only is the safer filter when you are writing to them; matching any position is worth it when you need the volume.
These companies are spread out. London is the largest single cluster at 23 per cent and the top five post towns together hold only 28 per cent, so the remaining 72 per cent sits across the rest of the country. A regional filter narrows this list without gutting it, which makes it a reasonable code to work territory by territory.
In practice the code on its own is rarely the whole filter. Pair 61900 with an incorporation date to catch companies in their first months, when they are still choosing suppliers, or with a filing deadline to reach them while the year end is on their mind. A worked example for this code: 61900, registered office in London, incorporated in the last ninety days, which turns a 11,300 company pool into a list you can write to in an afternoon. Add the poor-website filter if what you sell is a website, or a recent change of officer if you sell to whoever just took the job. Every company you pull carries the Companies House record, the director's name, a verified website and a verified email, and the ones we cannot complete are not charged.
Where SIC 61900 clusters in the UK
ACTIVE COMPANIES BY REGISTERED-OFFICE POST TOWN · COMPANIES HOUSE REGISTER, AUGUST 2026
SIC 61900 companies, as leads
Tell us the kind of company you sell to and we find them on the public record. One credit is one lead: the record, the director, a verified website and a verified email. If we cannot complete it, you are not charged. 25 free to start, no card.
About SIC 61900
How many UK companies use SIC code 61900?
11,300 active UK companies list 61900 (Other telecommunications activities) among their registered SIC codes. Each company may register up to four. Of those, 8,635 put it first. The figures come from the August 2026 Companies House register snapshot, and count active companies only.
Which code should a VoIP provider or telecoms reseller pick?
Use 61900, other telecommunications activities. It is the standard home for VoIP services, resellers, airtime dealers and ISPs running over networks owned by others. Codes 61100 and 61200 are for companies with their own wired or wireless infrastructure. You self-select the code at incorporation and can change it on any confirmation statement. No regulator or registry approval is involved.
We are an IT company that also sells broadband and phone systems. Division 61 or 62?
Register the code that matches your main revenue, then add the other. An IT support firm reselling connectivity usually pairs 62020 or 62090 with 61900. Companies House permits up to four SIC codes per company. Covering both activities is routine, and it shows your full offering to anyone reading the register.
Find UK SIC 61900 companies
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