01720 Area Code — Isles of Scilly, Isles of Scilly & St Mary's

01720 is the UK dialling code for Isles of Scilly, also serving Isles of Scilly, St Mary's, allocated by Ofcom under the National Telephone Numbering Plan.

Quick facts

About the 01720 dialling code

01720 is the UK geographic dialling code for Isles of Scilly, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Isles of Scilly area.

A full Isles of Scilly number is normally written as 01720 XXXXXX. You can dial the local part on its own from within the same area, or the full number from anywhere in the UK.

Because of UK number portability and internet calling, a 01720 number no longer guarantees the caller is physically in Isles of Scilly. Fraudsters also "spoof" local codes like 01720 so an unknown call looks like a nearby business or neighbour — so treat an unexpected call on what is actually said, not on the area code alone.

Map of the 01720 dialling area

The marker shows Isles of Scilly; the shaded circle is an approximate indication of the area the 01720 code serves — exact Ofcom charging-area boundaries are irregular and don't follow a neat radius.

Map data © OpenStreetMap contributors. View larger map

Areas typically served by 01720

Settlements in and around the Isles of Scilly dialling area that typically use 01720 numbers. Approximate — Ofcom charging-area boundaries don't follow town or county lines exactly, and properties near a boundary may take a neighbouring code.

Calling 01720 from abroad

From outside the UK, dial your international access prefix, then the UK country code 44, then 1720 (the area code without its leading zero) and the local number.

History of the 01720 code

The code was 0720 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01720.

Is a call from 01720 safe?

Most 01720 calls are ordinary local calls from Isles of Scilly homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01720 prefix so you are more likely to answer. Never share bank details, passwords or one-time security codes with an unexpected caller, even when the number looks local — hang up and call the organisation back on a number you have verified yourself.

To call a 01720 (Isles of Scilly) number from outside the UK, drop the leading zero and dial +44 1720 followed by the local number.

Operators serving Isles of Scilly

These UK communications providers have been allocated 01720 number blocks by Ofcom. The number of blocks per operator gives a rough sense of how widely each provider serves this area.

Ofcom number ranges on 01720

Ofcom's National Numbering Plan lists 523 number blocks under 01720, of which 81 are allocated to 77 communications providers. The first allocated blocks are shown below — look up any full number with the number checker to see its exact range holder.

Showing 12 of 81 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.

How to block and report 01720 spam calls

Block or report 01720

• You can block 01720 directly from your recent-calls list on iPhone or Android, and forward scam texts free to 7726.
• Scam or fraud calls should be reported to Action Fraud (0300 123 2040) or Police Scotland (101); persistent marketing calls to the ICO / TPS.

Full step-by-step instructions for every phone, network-level blocking and all UK reporting routes are in our guide: How to block and report unwanted calls in the UK.

Frequently asked questions about the 01720 code

Neighbouring dialling codes

Codes covering areas around Isles of Scilly — useful when a caller is nearby but outside the 01720 boundary.

Living in or moving to Isles of Scilly?

Our free postcode reports cover house prices, crime, broadband and schools for the districts around Isles of Scilly.

Check another UK number

Have the full 10- or 11-digit number? The UK Phone Number Checker shows the Ofcom range holder, risk level, and any community reports for that specific number.