Telephone numbers beginning with 01707 or 01727 belong to the Colney charge group.
The following numbers are local calls
to and from this charge group:
01438
01442
01582
01920
01923
01992
020
The following numbers are regional calls
to and from this charge group:
01223
01234
01245
01268
01276
01277
01279
01296
01322
01344
01371
01372
01375
01462
01474
01491
01494
01525
01628
01689
01708
01737
01753
01763
01767
01784
01799
01844
01883
01895
01908
01932
01959
All other calls are national calls.
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