01770 Area Code
The dialling code for Isle of Arran: what 01770 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01770 Area Code?
Isle of Arran landline number. 01770 is the dialling code for Isle of Arran. Numbers starting 01770 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Isle of Arran.
Who was the range allocated to?
Ofcom has allocated 01770 numbers to 75 providers. The largest holders are BT, Gamma Telecom Holdings Limited and Digital Space Group Limited.
Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Had a call from a 01770 number you don't recognise?
We can't tell you who called: an area code only shows the type of number and the provider Ofcom allocated the range to.
- Don't call back in a hurry, even if a message says it's urgent. Never give bank details or security codes on a call you didn't expect.
- Block the number from your phone's recent calls list.
- Forward scam texts free to 7726. Report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.
- Register your number with the Telephone Preference Service to opt out of sales calls.
About the 01770 Range
| Number type | Isle of Arran landline number |
|---|---|
| Area | Isle of Arran |
| Number format | 01770 XXXXXX |
| Allocated by Ofcom | 42% of the range, to 75 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 18 June 2026 |
Largest holders of 01770 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 11% | 15 July 1994 |
| Gamma Telecom Holdings Limited | 1% | 12 May 2005 |
| Digital Space Group Limited | 1% | 20 May 2008 |
| GCI Network Solutions Limited | 1% | 2 May 2017 |
| (Aq) Limited | 1% | 26 September 2012 |
| AQL Wholesale Ltd | 1% | 27 December 2007 |
69 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01770 Numbers
Where is the 01770 area code?
01770 is the dialling code for Isle of Arran. Numbers starting 01770 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Isle of Arran.
Is 01770 a mobile number?
No. 01770 is a landline (geographic) area code for Isle of Arran. UK mobile numbers start with 07.
Who does the 01770 range belong to?
Ofcom has allocated 01770 numbers to 75 providers. The largest holders are BT, Gamma Telecom Holdings Limited and Digital Space Group Limited. Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Who called me from a 01770 number?
We can't tell you who called. An area code only shows the type of number and which provider Ofcom allocated the range to. If you don't recognise a 01770 number, don't call back in a hurry, and never give out bank details or security codes on a call you didn't expect.
Block the number from your phone's recent calls list. Forward scam texts free to 7726, report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.