01842 Area Code — Thetford & Weeting

01842 is the UK dialling code for Thetford in Norfolk, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 111 distinct 01842 numbers across 147 public lookups.

Quick facts

About the 01842 dialling code

01842 is the UK geographic dialling code for Thetford, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Thetford area.

A full Thetford number is normally written as 01842 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 01842 number no longer guarantees the caller is physically in Thetford. Fraudsters also "spoof" local codes like 01842 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 01842 dialling area

The marker shows Thetford; the shaded circle is an approximate indication of the area the 01842 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 01842

Settlements in and around the Thetford dialling area that typically use 01842 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 01842 from abroad

From outside the UK, dial your international access prefix, then the UK country code 44, then 1842 (the area code without its leading zero) and the local number.

History of the 01842 code

The code was 0842 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01842.

In the letter-dialling era the code had the mnemonic TH2 — on an old rotary dial, the letters TH (from Thetford) sat on the same holes as the digits 842, so subscribers literally dialled the start of the town's name.

Top searched 01842 numbers

These are the 01842 numbers most-looked-up by visitors to our number checker. Click any number to see its full lookup page with risk-level, range holder, and community reports.

Is a call from 01842 safe?

Most 01842 calls are ordinary local calls from Thetford homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01842 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 01842 (Thetford) number from outside the UK, drop the leading zero and dial +44 1842 followed by the local number.

Operators serving Thetford

These UK communications providers have been allocated 01842 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 01842

Ofcom's National Numbering Plan lists 397 number blocks under 01842, of which 131 are allocated to 93 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 131 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.

How to block and report 01842 spam calls

Block or report 01842

• You can block 01842 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 01842 code

Neighbouring dialling codes

Codes covering areas around Thetford — useful when a caller is nearby but outside the 01842 boundary.

Living in or moving to Thetford?

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

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.