0551
05 corporate and VoIP range
0551 is a UK non-geographic range. Ofcom's register shows 13 allocated blocks held by 4 operators. BT holds the most, with 10 of the 13 allocated blocks. Data retrieved 2026-09-06.
- Allocated blocks
- 13
- Operators
- 4
- Free or protected
- 179
- Share allocated
- 7%
Who called you from 0551?
Calls from 0551 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 0551 numbers.
Which companies hold 0551 numbers
Ofcom allocates numbers to phone companies in blocks. These are the operators holding the most 0551 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 | 10 | 77% |
| 24 Seven Communications Limited | 1 | 8% |
| CFL Communications Ltd | 1 | 8% |
| Pulsant (Scotland) Limited | 1 | 8% |
What it costs to call 0551
Often outside inclusive minutes
05 numbers are used for corporate numbering and internet-based phone services. Many plans don't include them in free minutes, and prices vary a lot by provider. Check your tariff before calling back.
Inclusive minutes: Usually not. See the full UK call charges guide.
Had a suspicious call from 0551?
- 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 0551
What is a 0551 number?
0551 is a UK 05 corporate and voip range. 4 operators hold number blocks in this range according to Ofcom's allocation data.
Who called me from 0551?
Calls from 0551 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 0551 numbers.
How much does it cost to call 0551 numbers?
Often outside inclusive minutes. Full details in the cost section above.
Is a call from 0551 a scam?
The code alone can't tell you. Most calls from 0551 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.