Telephone numbers beginning with 01438 or 01920 belong to the Knebworth charge group.
The following numbers are local calls
to and from this charge group:
01279
01442
01462
01582
01707
01727
01763
01992
The following numbers are regional calls
to and from this charge group:
01223
01234
01245
01277
01296
01371
01376
01440
01480
01494
01525
01628
01708
01753
01767
01784
01799
01895
01908
01923
01933
01954
020
All other calls are national calls.
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