This is a list of geographic UK dialling codes covering Wales that are currently in use. Some exchanges cover both sides of the Wales-England border. All geographic telephone numbers in Wales are in the format (01xxx) xxxxxx, with the exception of Cardiff, Caerphilly and surrounding areas which are (029) xxxx xxxx.
(Source: "The Phone Book - Code Companion", BT)
Misconceptions
It is a common misconception that the code for Cardiff is 02920, whereas in fact it is 029. This is due to Cardiff previously having a 5 digit code (01222) and to the fact that most numbers there begin with 20. This problem is also widespread in cities with 02x codes such as Coventry, London, Portsmouth and Southampton, and in the province of Northern Ireland.
See also
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