Dunno how it works in the UK.

FYI: In the UK, cell phones (we call them 'mobiles' over here, though) aren't assigned to the normal area codes. Normal area codes begin with 01 or 02 (e.g. numbers in London are 020 xxxx yyyy, numbers in Cambridge are 01223 xxx yyy). Mobile phone numbers generally use an 07 code.
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-- roger