Telephone numbers beginning 023 are in southern England. The charge group they belong to depends on the first digit:
Charge group |
The following numbers are local calls to and from this charge group |
The following numbers are regional calls to and from this charge group | |
---|---|---|---|
8 | Southampton | 01329
01425
01489
01590
01794 01962 01983 |
01202
01243
01256
01258
01264 01420 01428 01635 01705 01722 01725 01730 01929 01980 023-9 |
9 | Portsmouth | 01243 01329 01489 01730 01983 | 01202
01252
01256
01264
01420 01425 01428 01590 01703 01725 01794 01798 01903 01962 023-8 |
All other calls are national calls.
Note: calls between charge groups can be dialled without the 023 prefix, even though they are regional calls.
023 has been introduced as a replacement for other numbers. The mapping was:
01703 AABBBB | became | 023 80AA BBBB |
01705 AABBBB | became | 023 92AA BBBB |
However, numbers only diallable using the full code changed as follows:
01703 UABBBB | became | 023 11UA BBBB |
01705 UABBBB | became | 023 10UA BBBB |
(where U is 0 or 1).
The new numbers were introduced by 1999-06-01 with parallel running until 2000-09-02. Dialling without codes involved a flash change early on 2000-04-22, with 6 digit dialling used before then and 8 digit dialling afterwards.