Division 61 of the UK SIC 2007 list. It holds 3 codes, listed in full below with the number of active UK companies filed under each.
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.
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.
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.
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.
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