0203 Numbers


In the UK, an 0203 number is a normal landline phone number within the London (020) area code.

Any UK number beginning with 020 is a London number. The '020' area code at the beginning is optional if you're dialling from one London 020 landline phone to another.


0203, 0207, 0208 or 020?

There is no 0203 area code. London has a single city-wide area code of 020, used with eight-digit local numbers.

The correct way to write a number beginning '0203' is (020) 3xxx xxxx, as this clearly distinguishes the optional 020 area code from the eight digit local phone number. (Why this matters...)