01951 Area Code — Colonsay, UK

01951 is the UK dialling code for Colonsay in Argyll and Bute, allocated by Ofcom under the National Telephone Numbering Plan.

Quick facts

About the 01951 dialling code

01951 is the UK geographic dialling code for Colonsay, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Colonsay area.

A full Colonsay number is normally written as 01951 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 01951 number no longer guarantees the caller is physically in Colonsay. Fraudsters also "spoof" local codes like 01951 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 01951 dialling area

The marker shows Colonsay; the shaded circle is an approximate indication of the area the 01951 code serves — exact Ofcom charging-area boundaries are irregular and don't follow a neat radius.

Map data © OpenStreetMap contributors. View larger map

Calling 01951 from abroad

From outside the UK, dial your international access prefix, then the UK country code 44, then 1951 (the area code without its leading zero) and the local number.

History of the 01951 code

The code was 0951 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01951.

Is a call from 01951 safe?

Most 01951 calls are ordinary local calls from Colonsay homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01951 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 01951 (Colonsay) number from outside the UK, drop the leading zero and dial +44 1951 followed by the local number.

Operators serving Colonsay

These UK communications providers have been allocated 01951 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 01951

Ofcom's National Numbering Plan lists 487 number blocks under 01951, of which 89 are allocated to 78 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 89 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.

How to block and report 01951 spam calls

Block or report 01951

• You can block 01951 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 01951 code

Neighbouring dialling codes

Codes covering areas around Colonsay — useful when a caller is nearby but outside the 01951 boundary.

Living in or moving to Colonsay?

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

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.