023 area code: Portsmouth and Southampton
023 is the UK dialling code for Portsmouth and Southampton, in England. Numbers are 023 followed by 8 digits.
- Area
- Portsmouth, Southampton
- Where
- England
- Written as
- 023 xxxx xxxx
- Digits in a full number
- 11, including the 0
- Calling from abroad
- +44 23 xxxxxxxx
- Phone companies holding ranges
- 139 (Ofcom allocation data). This doesn’t show which company a particular number is with, or who uses it.
Where 023 is
Portsmouth is a city in England. The code also covers Southampton.
Could it be someone you know?
A number showing 023 might look familiar. Check the full number before trusting the caller. It can help to think whether you know someone in or around Portsmouth, Fareham or Bishops Waltham, have used a business there, booked or applied for something nearby, or are expecting a callback.
Codes near Portsmouth
Straight-line distance from Portsmouth.
Does 023 tell me who called?
No. 023 is assigned to Portsmouth and Southampton, 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 139 phone companies hold ranges of 023 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 023 numbers
From reports people have sent us. We don’t check them, and a report is not proof.
Last report under 023: 26 September 2026.
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