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File:Thailand telephone area codes.svg - Wikimedia Commons
Old telephone area codes with letters UK: direct dialling
Telephone area codes: Find UK dialling codes for numbers starting 01 and 02 - Ofcom
01483 View Map of the Guildford Area Code
020 View Map of the London Area Code
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Ringing the changes: do phone numbers still matter? | Ofcom | Official Press Release
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
STD Code Helper:Amazon.co.uk:Appstore for Android
Dialling Codes in Britain | Britain Visitor - Travel Guide To Britain
01438 View Map of the Stevenage Area Code
What is an 0203 Number Anyway | eReceptionist
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History - Telephones UK
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0161 View Map of the Manchester Area Code
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024 Area Code - Telephone Dialling Code For Coventry - 024 Number UK
Area codes 304 and 681 - Wikipedia
What is the calling code for the United Kingdom? Making your phone c - Wise, formerly TransferWise
Annex L: Telephone area codes and local authority areas in Scotland - Effectiveness of actions to reduce harm from nuisance calls in Scotland - gov.scot
Sondhwa STD Code | STD Code for sondhwa | 07395 STD Code | STD Code of Sondhwa - Golden Chennai