Norwich phone numbers start 01603
Norwich is in Norfolk, and its landline numbers begin 01603.
An 01603 number does not prove the caller is in Norwich
90 phone companies hold 01603 ranges, a number keeps its code when it moves provider, and caller ID can be faked outright. The code tells you which exchange the range was allocated to - nothing about who dialled.
- Area code
- 01603
- Administrative area
- Norfolk
- Nation
- England
- Population
- 195,971
- This town
- The place 01603 is named after
- Phone companies holding ranges
- 90
Numbers reported on 01603
Nobody has reported an 01603 number to this site yet. That does not mean an 01603 number is safe - it means no one has told us about one.
Other places on 01603
01603 covers more than Norwich. A call showing this code could have been allocated to a range at any of these exchanges.
Codes near Norwich
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Buy us a coffeeArea code and range data from Ofcom's published allocations, downloaded 1 October 2026. Town locations, populations and administrative areas from Wikidata (CC0), joined 1 October 2026 - towns within 40 km of the exchange. Reports are from visitors to this site and are unchecked. Browse every town A-Z.