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0897 was never used as an area code 0897 later used for BT Premium rate numbers; changed from 0897 to 09xx on 28 April 2001. 01898 — unused; original area allocation unknown 0898 later used for BT Premium rate numbers; changed from 0898 to 09xx on 28 April 2001. 01899 — Biggar, Tweed (TW9)
This leads to a restriction as to which initial digits can be used for subscriber numbers within those four-digit area codes, e.g. in the 01387 four-digit area code, subscriber numbers cannot begin with a 3 because 013873 is a separate five-digit area code; likewise in the 01946 four-digit area code, subscriber numbers cannot begin with a 7 ...
As the telephone system was modernised and liberalised with multiple telephone companies and numbers became portable, the rigid correspondence of numeric codes to exchanges was relaxed, but even today it is likely that a (7)387 number, for example, is located in the Euston area. Lists of numbers allocated to BT exchanges in the UK, including ...
The misconception of area code and number separation is also seen in other areas of the country where the area code length was reduced in the Big Number Change such as Coventry being written as 02476 xxxxxx, whereas the correct number sequence is (024) 76xx xxxx (Coventry now has some (024) 77xx xxxx and (024) 75xx xxxx numbers) and Cardiff ...
PhONEday had cleared area codes from 02 to 09 of all geographic allocations by converting 9-digit numbers to 10-digit 01 numbers (and, in parts of at least 47 area codes, 8-digit numbers to 9-digit 01 numbers). After PhONEday, all pre-existing 9-digit mobile, non-geographic, premium rate, personal and pager numbers from 02 to 09 remained in place.
Some widespread misunderstandings about area codes came about with the Big Number Change, most notably with London area codes. There is a widespread but erroneous assumption that London has several area codes – 0203, 0204, 0207 and 0208 – whereas, in fact, it has just one: 020. Similar misunderstandings came about with a few other area codes.