Sales Director
Choosing a business telephone number sounds like a small decision until you realise how much it actually signals to a customer before they've even spoken to you. A local area code says "we're on your doorstep." A national 03 number says "we're a proper, established outfit." A freephone number says "this call won't cost you a penny." Get it wrong, and you're either paying for a type of number your customers don't need, or missing out on the trust a familiar dialling code brings.
This guide covers everything a UK business needs to know before buying a number: the different types available, what they cost, how area codes work, whether you can have a number for a city you're not actually based in, and what the PSTN switch-off means for the number you've already got. If you already know which area code you want, you can jump straight to buy a UK telephone number or use the area code finder to look one up.
Ofcom's numbering rules exist to keep the system fair and predictable, but the psychology of a phone number is entirely down to the person looking at it. A landline-style number still reads as more credible than a mobile number on an invoice, a van, or a Google Business Profile — and a number that matches the customer's own area code reads as more credible still. T2K's own data suggests local numbers get answered considerably more often than mobile or non-geographic alternatives, which lines up with what most UK businesses already sense instinctively: people are more comfortable picking up a call from "their" area.
This isn't just a London or Manchester phenomenon. A trades business in Totton presenting a Southampton 023 number, or a firm in Christchurch using a Bournemouth 01202 number, gets exactly the same benefit — the number simply needs to match where the customer expects the business to be, which, thanks to VoIP, doesn't have to be where the business is actually registered.
Every geographic UK landline number starts with 01 or 02, followed by an area code that identifies where the number originates — Ofcom calls this the National Telephone Numbering Plan. Larger cities such as London (020), Birmingham (0121) and Manchester (0161) have shorter, four-digit codes, which gives more digits left over for local numbers and therefore greater capacity. Smaller towns tend to have longer, five-digit codes — Bournemouth's 01202 or Dorchester's 01305, for example — because far fewer numbers are needed there.
Importantly, Ofcom's rules permit out-of-area use of geographic numbers. A business doesn't need premises in a city to hold that city's area code — it simply needs a VoIP provider able to allocate and route the number.
03 numbers — including the 0300, 0330, 0333 and 0345 ranges — are non-geographic, meaning they give no clue as to where the business is based. Under Ofcom's General Conditions, calls to any 03 number must cost no more than a call to a standard 01 or 02 number, and must be included in any bundled minutes a caller already has. Revenue sharing is prohibited on 03 numbers, which is exactly why so many organisations have migrated away from 0845 and 0870 in recent years — those older ranges could charge callers considerably more, particularly from a mobile.
0800 and 0808 numbers are free for the caller from both landlines and mobiles, with the receiving business covering the cost per minute instead. These suit businesses running sales lines or customer support where removing any friction from the decision to call matters more than the cost of taking the call.
These older non-geographic ranges can carry a service charge on top of the caller's normal access charge, and historically allowed revenue sharing — which is a large part of why 0844 and 0870 numbers have fallen out of favour. Many callers now actively avoid dialling them. For most businesses, a 03 number does the same job at a lower cost to the customer.
Mobile numbers start 07 and carry no geographic meaning. A virtual number, by contrast, can be any of the above number types but isn't tied to a physical SIM or handset — calls route over VoIP to whichever device, app or hunt group the business chooses.
Pricing varies by provider, but the pattern across the market is consistent enough to plan around:
| Number type | Typical monthly cost | Who pays for calls |
|---|---|---|
| Geographic VoIP number (01/02) | £3–£15 | Caller, at standard geographic rate |
| National number (03) | £3–£15 | Caller, capped at geographic rate |
| Freephone (0800/0808) | £5–£20 | Business pays per minute for inbound calls |
| Traditional BT/Openreach landline | £25–£35 line rental, before call charges | Caller, plus separate call charges apply |
On top of number rental, expect outbound and inbound call charges of roughly 2–8p per minute on most VoIP plans — a fraction of what a traditional landline typically costs once line rental and call charges are added together.
Yes. This is one of the most common questions businesses ask, and the answer is straightforward: Ofcom's rules explicitly allow out-of-area use of geographic numbers, so a business anywhere in the UK can hold a local number for any area code without needing an office, staff or premises there. In practice this is done through a VoIP provider, which allocates the number from the relevant area code block and routes calls to wherever the business actually operates — a desk phone, a softphone app, or a mobile.
This matters for a few very practical reasons:
The process is quicker than most businesses expect. Broadly, it runs in four stages:
If you already have a number and simply want to move it to a new provider or system, you don't need to give it up. Number portability is a legal right in the UK, set out under Ofcom's General Condition B3 — a provider cannot refuse to port a number you're entitled to, and cannot place unreasonable technical obstacles in the way.
Mobile numbers must be ported within one working day under Ofcom's rules. Fixed and geographic business numbers don't carry the same fixed statutory deadline — Ofcom simply requires porting "as soon as is reasonably practicable" — but in practice, most geographic and non-geographic business number ports complete within 5–10 working days.
Throughout the process, your customers and suppliers continue calling the exact same number — the only thing that changes is the underlying technology carrying the call.
Openreach is retiring the UK's copper telephone network — the Public Switched Telephone Network, or PSTN — with a full switch-off now set for 31 January 2027. The date has already been pushed back twice from an original target of December 2025, largely to protect vulnerable customers relying on telecare devices, but industry bodies and Ofcom have been clear that this date is now locked in.
For a business, the practical impact is this: any phone line, alarm system, door entry system or card machine still running over a traditional copper line needs to move to a digital, IP-based connection before the deadline. Crucially, your telephone number itself doesn't change — a 0113 Leeds number stays a 0113 Leeds number, a 0161 Manchester number stays a 0161 Manchester number. Only the technology carrying the call moves from copper to VoIP. If you're not sure where your current setup stands, T2K's PSTN switch-off checker is a quick way to find out.
T2K supplies geographic numbers for every UK area code — from major cities to smaller towns across Dorset, Hampshire and beyond. Below is a regional breakdown of the areas covered on this site, each linking through to pricing, porting and setup details for that specific code.
Can't see the town or city you need listed above? T2K covers more than 400 UK area codes in total — use the area code finder to search by location or dialling code, including smaller towns across Dorset and Hampshire such as Dorchester, Weymouth, Christchurch, Totton, Salisbury and Winchester.
Yes. Ofcom permits out-of-area use of geographic numbers, so a business anywhere in the UK can hold a local number for any area code via a VoIP provider — no office or premises in that location required.
Typically £3–£15 a month for a geographic VoIP number, and £5–£20 for a freephone (0800/0808) number, compared with £25–£35 a month for a traditional BT landline rental alone, before call charges.
01 and 02 numbers are geographic and location-specific. 03 numbers are non-geographic but must cost the same as calling an 01 or 02 number and count in bundled minutes. 0800 and 0808 numbers are freephone and cost the caller nothing at all.
Mobile numbers must port within one working day under Ofcom's rules. Geographic and non-geographic business numbers don't have a fixed statutory timescale but typically complete within 5–10 working days.
Openreach is retiring the UK's copper phone network by 31 January 2027, after two delays from the original December 2025 date. Businesses on traditional landlines or ISDN need to move to VoIP before then.
No. Ofcom's rules allow a business to be allocated a geographic number for any UK area code, regardless of where the company is physically registered or trading from.
It's the numerical prefix — always starting 01 or 02 — that identifies the geographic origin of a UK landline number, allocated and administered by Ofcom under the National Telephone Numbering Plan. "Area code," "dialling code" and "STD code" all refer to the same thing.
Yes. There's no limit on how many area codes a business can hold numbers for, and multiple locations can be ordered and provisioned together in a single request — useful for any business covering several towns or cities.
023 is shared between Southampton and Portsmouth. Southampton numbers begin 023 8, and Portsmouth numbers begin 023 9 — both cities sit within the same area code block but are distinguished by the next digit of the local number.
Ready to get a number live? Browse UK telephone numbers by area code and have your business taking calls on a new number the same day.
With over 25 years’ experience at T2k, Lee began his career as a telecoms engineer before progressing to Sales Director. He leverages his foundational technical knowledge to provide businesses with impartial, expert advice on modern communications, specialising in VoIP and cloud telephony. As a primary author for T2k, Lee is dedicated to demystifying complex technology for businesses of all sizes.
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