01603 area code: Norwich
01603 is the UK dialling code for Norwich, in England. Numbers are 01603 followed by 6 digits.
- Area
- Norwich
- Where
- England
- Written as
- 01603 xxxxxx
- Digits in a full number
- 11, including the 0
- Calling from abroad
- +44 1603 xxxxxx
- Phone companies holding ranges
- 90 (Ofcom allocation data). This doesn’t show which company a particular number is with, or who uses it.
Where 01603 is
Norwich is a city in England.
Could it be someone you know?
A number showing 01603 might look familiar. Check the full number before trusting the caller. It can help to think whether you know someone in or around Norwich, Brooke or Wymondham, have used a business there, booked or applied for something nearby, or are expecting a callback.
Codes near Norwich
Straight-line distance from Norwich.
Does 01603 tell me who called?
No. 01603 is assigned to Norwich, but that doesn’t prove who is calling or where they are. Caller ID can be faked, a number keeps its code when it moves provider, and 90 phone companies hold ranges of 01603 numbers. Search the full number to see what people have reported about it and which phone company its range was given to.
Caller says they’re your bank, HMRC, the police or a courier? Hang up and call a number you trust, from your card, a letter or their website, or dial 159 for most UK banks.
Reported 01603 numbers
Nobody has reported an 01603 number to us yet. If one has been calling you, report it so the next person sees it.
Codes, code lengths and provider counts from Ofcom’s numbering data, downloaded 23 September 2026. Places from Wikidata. All UK area codes · Who called me? · Stop spam calls