0303
03 non-geographic range
0303 is a UK non-geographic range. Ofcom's register shows 61 allocated blocks held by 27 operators. BT holds the most, with 25 of the 61 allocated blocks. Data retrieved 2026-09-06.
- Allocated blocks
- 61
- Operators
- 27
- Free or protected
- 938
- Share allocated
- 6%
Who called you from 0303?
Calls from 0303 numbers usually come from organisations rather than individuals: helplines, switchboards, customer service teams and outbound call centres. The allocation data below shows which phone companies hold 0303 numbers.
Which companies hold 0303 numbers
Ofcom allocates numbers to phone companies in blocks. These are the operators holding the most 0303 blocks. The company that was issued a number often supplies it onward to a business or reseller, and UK numbers can be ported between networks, so read this as where the number started, and a strong hint rather than proof of who serves it today.
| Operator | Blocks held | Share of allocated |
|---|---|---|
| BT | 25 | 41% |
| Colt Technology Services | 5 | 8% |
| Gamma Telecom Holdings Limited | 4 | 7% |
| GCI Network Solutions Limited | 2 | 3% |
| Telecoms World Direct Limited | 2 | 3% |
| Windsor Telecom Limited | 2 | 3% |
| Accounts Centre Limited | 1 | 2% |
| Atomstream Limited | 1 | 2% |
| Business Broadcast Communications Limited | 1 | 2% |
| CINOS LIMITED | 1 | 2% |
| Content Guru Limited | 1 | 2% |
| Digital Space Group Limited | 1 | 2% |
Plus 15 further operators with smaller holdings.
What it costs to call 0303
Same price as calling a landline
Ofcom rules say 03 numbers must cost the same as calling an 01 or 02 number, and they must come out of your inclusive minutes if you have them. A company can't make money from you calling its 03 number.
Inclusive minutes: Yes, by regulation. See the full UK call charges guide.
Had a suspicious call from 0303?
- Hang up. If the caller claimed to be your bank or a government body, find the organisation's number yourself and call back on that.
- Forward the number and what was said to 7726, the free spam-reporting service on every UK network.
- If you lost money or gave away details, report it to Action Fraud on 0300 123 2040 (or Police Scotland on 101 in Scotland).
- Persistent marketing calls? Report them to the ICO and register with the TPS. Full walkthrough in our report a call guide.
Questions people ask about 0303
What is a 0303 number?
0303 is a UK 03 non-geographic range. 27 operators hold number blocks in this range according to Ofcom's allocation data.
Who called me from 0303?
Calls from 0303 numbers usually come from organisations rather than individuals: helplines, switchboards, customer service teams and outbound call centres. The allocation data below shows which phone companies hold 0303 numbers.
How much does it cost to call 0303 numbers?
Same price as calling a landline. Full details in the cost section above.
Is a call from 0303 a scam?
The code alone can't tell you. Most calls from 0303 numbers are legitimate, but scammers can dial from, or pretend to dial from, any range. Never hand over passwords, PINs or remote computer access to an inbound caller. If in doubt, hang up and call the organisation back on the number printed on its website or your paperwork.
How do I report a nuisance or scam call?
Forward scam call details to 7726 (free, all UK networks), report fraud to Action Fraud on 0300 123 2040, and report persistent nuisance calls to the ICO. Our report a call guide walks through each route.
Source: Ofcom telephone numbering allocation data, retrieved 2026-09-06 and reproduced with acknowledgement under Ofcom's re-use terms. Figures describe number blocks, and a block being allocated to an operator says nothing about any individual caller. Last verified by a human on 2026-09-06.