020 View Map of the London Area Code
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The original 1947 Telephone Area Code Map - Codes were assigned based on population and time it took to dial the code on a rotary phone dial. High population areas got small
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0141 area code | Telephone Dialling Code For Glasgow
History - Telephones UK
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01483 View Map of the Guildford Area Code
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0161 View Map of the Manchester Area Code
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Telephone area code map of US [3500x1919] : r/MapPorn
A Guide to UK STD Phone Number Area Codes | Yay
Telephone numbers in India - Wikipedia
01438 View Map of the Stevenage Area Code
