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UK Telephone Area Codes Location
25 May 2009
Mobile Telephone Base Station Database (Site Finder)
010                  
      0113 0114 0115 0116 0117 0118  
0120 0121 0122 0123 0124 0125 0126 0127 0128 0129
0130 0131 0132 0133 0134 0135 0136 0137 0138 0139
0140 0141 0142 0143 0144 0145 0146 0147 0148 0149
0150 0151 0152 0153 0154 0155 0156 0157 0158 0159
0160 0161 0162 0163 0164 0165 0166 0167 0168 0169
0170 0171 0172 0173 0174 0175 0176 0177 0178 0179
0180 0181 0182 0183 0184 0185 0186 0187 0188 0189
0190 0191 0192 0193 0194 0195 0196 0197 0198 0199
020     023 024       028 029
030       033   034       037      
04                    
050         055 056      
06                    
070         075 076 077 078 079
080   082   084     087    
090 091                

To identify a geographic area, click on the first few digits of the code.   

International Codes ListRedundant 00xx Codes List
All current telephone area codes (July 2005) prefixed 01xxx were formerly prefixed 0xxx.
London

01 was the area code for London.

The code was split into inner London 071 and outer London 081.

These codes were changed to 0171 and 0181. 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.