Telephone numbers beginning with 01933 belong to the Wellingborough charge group.
The following numbers are local calls
to and from this charge group:
01234
01480
01536
01604
01832
The following numbers are regional calls
to and from this charge group:
0116
01223
01280
01296
01327
01354
01438
01442
01462
01487
01525
01572
01582
01664
01731
01733
01763
01767
01778
01780
01788
01858
01908
01920
01954
All other calls are national calls.
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