05 corporate and VoIP range
0558
Who called you from 0558?
Calls from 0558 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 0558 numbers.
Was it a scam?
The code alone can't tell you, and anyone who says otherwise is guessing. What settles it is the call itself: a genuine organisation survives you hanging up and ringing back on the number from its website or your paperwork. If the caller wanted money, bank details, one-time codes or remote access to your computer, treat it as hostile.
What to do now
- Missed call, no voicemail? Don't ring back numbers you don't recognise. Anything important comes back properly.
- Suspicious call: forward the number and what was said to 7726, free on every UK network.
- Lost money or gave away details: Action Fraud, 0300 123 2040 (Police Scotland on 101 in Scotland), and your bank on the number on your card.
- If a caller claims to be from a government department, ring the department back on its official number, which ContactNumbers lists with the source.
- Full walkthrough in the report a call guide.
05 corporate and VoIP range: what the register shows
0558 is a UK non-geographic range. Ofcom's register shows 1 allocated blocks held by 1 operator. Flextel Limited holds the most, with 1 of the 1 allocated blocks. Data retrieved 2026-10-22.
- Allocated blocks
- 1
- Operators
- 1
- Free or protected
- 99
- Share allocated
- 1%
Which companies hold 0558 numbers
Ofcom allocates numbers to phone companies in blocks. These are the operators holding the most 0558 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 |
|---|---|---|
| Flextel Limited | 1 | 100% |
What it costs to call 0558
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.
Questions people ask about 0558
What is a 0558 number?
0558 is a UK 05 corporate and voip range. 1 operator holds number blocks in this range according to Ofcom's allocation data.
Who called me from 0558?
Calls from 0558 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 0558 numbers.
How much does it cost to call 0558 numbers?
Often outside inclusive minutes. Full details in the cost section above.
Is a call from 0558 a scam?
The code alone can't tell you. Most calls from 0558 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 2026-10-22 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 2026-10-22.