01603 Area Code — Norwich, UK

01603 is the UK dialling code for Norwich, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 540 distinct 01603 numbers across 773 public lookups.

Quick facts

About the 01603 dialling code

01603 is the UK geographic dialling code for Norwich, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Norwich area.

A full Norwich number is normally written as 01603 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 01603 number no longer guarantees the caller is physically in Norwich. Fraudsters also "spoof" local codes like 01603 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.

Top searched 01603 numbers

These are the 01603 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 01603 safe?

Most 01603 calls are ordinary local calls from Norwich homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01603 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 01603 (Norwich) number from outside the UK, drop the leading zero and dial +44 1603 followed by the local number.

Operators serving Norwich

These UK communications providers have been allocated 01603 number blocks by Ofcom. The number of blocks per operator gives a rough sense of how widely each provider serves this area.

How to block and report 01603 spam calls

Block or report 01603

• You can block 01603 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 01603 code

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.