- Prefix
01770 5- Area
- Isle of Arran
- Number type
- Geographic landline (01/02)
- Format
01770 5XXXXX- From abroad
+44 1770 5XXXXX- Ofcom blocks in range
- 28
- Blocks in service
- 17
- Range holders
- 17
What are 01770 5XXXXX numbers?
Any UK number matching 01770 5XXXXX sits in the
01770 dialling code for Isle of Arran.
Ofcom hands these numbers to communications providers in blocks; this range
contains 28 blocks, of which
17 are allocated and usable. Calls from these
numbers are typically homes and businesses in the Isle of Arran area — or
organisations elsewhere that keep a local 01770 presence using
VoIP.
Who holds 01770 5… number ranges?
| Range holder (allocated by Ofcom) | Number blocks | Example range |
|---|---|---|
| Andrews & Arnold (Numbers) Ltd | 1 | 01770 55XXXX |
| Atomstream Limited | 1 | 01770 598XXX |
| CFL Communications Ltd | 1 | 01770 58XXXX |
| Convergence Group (wireless) Networks Limited | 1 | 01770 590XXX |
| Core Telecom Limited | 1 | 01770 592XXX |
| Digital Space Group Limited | 1 | 01770 517XXX |
| GCI Network Solutions Limited | 1 | 01770 594XXX |
| IPV6 Limited | 1 | 01770 53XXXX |
| Mars Communications Limited | 1 | 01770 52XXXX |
| Nexus Telecommunications Limited | 1 | 01770 54XXXX |
| Solutios Limited | 1 | 01770 50XXXX |
| Suretec Systems Ltd | 1 | 01770 595XXX |
…and 5 more providers hold smaller allocations in this range.
Ofcom’s data shows the provider each number range was originally allocated to — not who holds an individual number today. Numbers are frequently moved (ported) between providers, and no public database reveals the person or business behind a specific number, so treat any service that claims to with suspicion.
Not every block in this range is in service: of the 28 blocks Ofcom lists, 11 are protected (reserved by Ofcom and not in use). A call appearing to come from an unallocated block is a strong sign of a spoofed number.
Is a call from a 01770 5… number safe?
A local-looking number is never proof of who is calling: fraudsters spoof 01770 caller IDs so their calls look like they come from Isle of Arran (‘neighbour spoofing’). If an unexpected caller asks for personal, banking or one-time-code details, hang up and ring the organisation back on a number you find independently. To put a name to a caller, see who called me?; to report one, see how to report a scam number.
Check a specific 01770 5XXXXX number
Paste any full number into the checker above (or on the main phone number checker) to see its exact range holder and allocation status from this week’s Ofcom data.
Run mobiles for a business? See our business mobile network comparison or get a quote.
More 01770 number ranges
Full 01770 Isle of Arran area-code guide › · All UK area codes ›