01720 Area Code
The dialling code for Isles of Scilly: what 01720 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01720 Area Code?
Isles of Scilly landline number. 01720 is the dialling code for Isles of Scilly. Numbers starting 01720 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Isles of Scilly.
Who was the range allocated to?
Ofcom has allocated 01720 numbers to 77 providers. The largest holders are Digital Space Group Limited, Simwood eSMS Limited and (Aq) 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 01720 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 01720 Range
| Number type | Isles of Scilly landline number |
|---|---|
| Area | Isles of Scilly |
| Number format | 01720 XXXXXX |
| Allocated by Ofcom | 32% of the range, to 77 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 29 June 2026 |
Largest holders of 01720 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| Digital Space Group Limited | 1% | 20 May 2008 |
| Simwood eSMS Limited | 1% | 2 February 2012 |
| (Aq) Limited | 1% | 12 September 2012 |
| AQL Wholesale Ltd | 1% | 4 August 2006 |
| Andrews & Arnold (Numbers) Ltd | 1% | 27 March 2009 |
| BT | 1% | 15 July 1994 |
71 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01720 Numbers
Where is the 01720 area code?
01720 is the dialling code for Isles of Scilly. Numbers starting 01720 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Isles of Scilly.
Is 01720 a mobile number?
No. 01720 is a landline (geographic) area code for Isles of Scilly. UK mobile numbers start with 07.
Who does the 01720 range belong to?
Ofcom has allocated 01720 numbers to 77 providers. The largest holders are Digital Space Group Limited, Simwood eSMS Limited and (Aq) 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 01720 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 01720 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.