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UK Telephone Area Codes Location
25 May 2009
020-0  
020-1  
020-2  
020-3 London (anywhere)
020-4  
020-5  
020-6  
020-7 London (inner)
020-8 London (outer)
020-9  

01 was the area code for London.

On 6 May 1990, the 01- code was split into inner London 071- and outer London 081-.

On 16 April 1995 these codes were changed to 0171- and 0181-.

On 22 April 2000 both codes were consolidated into 020-.

An 01-xxx xxxx number became either an 071-xxx xxxx or 081-xxx xxxx number (ditto 0171- and 0181-) and today the original 01-xxx xxxx (if unchanged) will be either 020-7xxx xxxx or 020-8xxx xxxx.

Please note: the correct area code for London is 020-.

0207- is actually 020-7xxx xxxx and 0208- is actually 020-8xxx xxxx