Uk mobile phone numbers talk dirty
The overall structure of the UK's National Numbering Plan is: In the United Kingdom, area codes are two, three, four, or, rarely, five digits long (after the initial zero).
Regions with shorter area codes, typically large cities, permit the allocation of more telephone numbers as the local number portion has more digits.
Five of these were moved in 1995 as a part of Ph ONEday, with Reading then following a year later.
At the time of the change, an extra digit was added to the subscriber number.
The "area code" is also referred to as an "STD (code)" (subscriber trunk dialling) or a "dialling code" in the UK.
The code allocated to the largest population is (020) for London.
If a number begins with 09 then they are usually ‘premium rate’ service numbers; whilst those beginning with 118 are directory enquiry numbers.
These six areas have a three-digit area code matching the pattern 1x1 (after the initial zero) and a seven digit subscriber number, and this is known as 3 7 format.
This is the geographic number format for the second round of large cities and towns moved to brand-new three-digit area codes.
The number of places with five digit subscriber numbers and an 01xxx area code has declined rapidly in recent decades.
There were 511 ranges allocated across 56 different area codes in January 1998.