Telephone numbers beginning with 01923 belong to the Watford charge group.
The following numbers are local calls
to and from this charge group:
01442
01494
01582
01707
01727
01753
01784
01895
020
The following numbers are regional calls
to and from this charge group:
0118
01234
01252
01276
01277
01279
01280
01293
01296
01306
01322
01344
01372
01438
01462
01483
01491
01525
01628
01689
01708
01734
01737
01763
01767
01844
01883
01908
01920
01932
01959
01992
All other calls are national calls.
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