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 42 distinct 01603 numbers across 50 public lookups.

Quick facts

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.

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.

Looking up a specific 01603 number?

If you have the full 10- or 11-digit number, use our free UK Phone Number Checker to see the Ofcom range holder, risk level, and any community reports for that specific number.