Telephone numbers beginning 023

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.

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