The Malmesbury area code
01666
Who called you from 01666?
A call from an 01666 number is a call from a number registered to the Malmesbury area. That could be a local business, a GP surgery, a school, or a call centre that bought local numbers to look local. Ofcom's allocation data tells you which phone company issued the number, and that's the most anyone can tell you from the number alone.
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.
The Malmesbury area code: what the register shows
01666 is the dialling code for Malmesbury. Ofcom's allocation register lists 110 number blocks in this code, issued to 88 different phone companies. BT holds the most, with 10 of the 110 allocated blocks. Recorded allocations run from 15 July 1994 to 26 January 2026. Data retrieved 2026-10-22.
- Allocated blocks
- 110
- Operators
- 88
- Free or protected
- 258
- Share allocated
- 30%
Which companies hold 01666 numbers
Ofcom allocates numbers to phone companies in blocks. These are the operators holding the most 01666 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 | 9% |
| Vodafone Ltd (C&W) | 8 | 7% |
| GCI Network Solutions Limited | 3 | 3% |
| Colt Technology Services | 2 | 2% |
| Digital Space Group Limited | 2 | 2% |
| Sky UK Limited | 2 | 2% |
| TalkTalk Communications Limited | 2 | 2% |
| (AQ) LIMITED | 1 | 1% |
| 24 Seven Cloud Communications Ltd | 1 | 1% |
| 8x8 Communications UK Limited | 1 | 1% |
| AQL Wholesale Ltd | 1 | 1% |
| Adepteo Limited | 1 | 1% |
Plus 76 further operators with smaller holdings.
What it costs to call 01666
Standard landline rate
Calls to this code cost the same as any UK landline call. On most landline and mobile plans they come out of your inclusive minutes, so a call usually costs you nothing extra.
Inclusive minutes: Yes, on almost every UK plan. See the full UK call charges guide.
Questions people ask about 01666
Where is the 01666 area code?
01666 is the UK dialling code for Malmesbury. Numbers starting 01666 are geographic landline numbers registered to that area.
Who called me from an 01666 number?
The number belongs to one of 88 phone companies holding 01666 number blocks, with BT holding the most. The operator table on this page shows who issues 01666 numbers. The caller could be anyone using a number from that range, and caller ID can be spoofed, so an unexpected call asking for personal details deserves suspicion wherever it appears to come from.
How much does it cost to call 01666 numbers?
Standard landline rate. Full details in the cost section above.
Is a call from 01666 a scam?
The code alone can't tell you. Most calls from 01666 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.
Related codes
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.