Why UK area codes are numbered as they are : r/CasualUK
How letters were used for digits in United Kingdom telephone exchange names and dialling codes up to the 1960's
Remember the London Code Changes on 6 May
London to get 10million new landline numbers with launch of new dialling code | London Evening Standard | Evening Standard
Area Code Maps | Commission for Communications Regulation
0207 Numbers: A Complete Guide - Deadline News
Ringflow: Unlocking the Mystery UK Phone Number Format Demystified | by Ringflow | Medium
London set to outgrow area code - again! - Boxx Communications Ltd
London set to outgrow area code - again! - Boxx Communications Ltd
Which telephone country code starts with +171, as in +171470---50? - Quora
Telephone numbers in Belgium - Wikipedia
What Do 0203 Phone Numbers Mean? | Londonist
Is it possible to get an area code from UK mobile number? - Quora
History - Telephones UK
Dialling Code Booklets, your memories? - UK Vintage Radio Repair and Restoration Discussion Forum
A Little History of London Phone Numbers - VIP VoIP
What Do 0203 Phone Numbers Mean? | Londonist
Fictional phone numbers in For All Mankind – alexwlchan
History Of London's Phone Codes
History - Telephones UK
0204 Numbers – New London Area Code - Tamar Telecom
