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A UK telephone number beginning with 074 is a mobile phone.
01691
A UK telephone number beginning with +44 754 is a mobile.
The first telephone area codes were issued for the USA and Canada in 1947. The first telephone area codes were issued in the UK in 1958.
01931 is the telephone code for Shap, Westmorland (near Penrith in Cumbria).
UK telephone area code 0161 is Manchester, but 0161 553 is an invalid number block.
01792 is the area code for Swansea
UK telephone area code 01954 (or +44 1954 in international format) is Madingley, Willingham, near Cambridge.
UK telephone area codes were first assigned in 1958.
In the UK, area code 020 is London, but there are no numbers beginning with 020 2. Other countries may have similar telephone area codes.
It varies in the UK - depending on the area it covers. anywhere from 1cm to 5cm.
Until the early 1990's, area code +44 21 (or 021 within the UK) was Birmingham, which is now area code +44 121 (or 0121 within the UK). There has never been an area code +44 217 (or 0217) in the UK.