Telephone numbers beginning with 01603 belong to the Norwich charge group.
The following numbers are local calls
to and from this charge group:
01263
01362
01493
01508
01692
01953
The following numbers are regional calls
to and from this charge group:
01328
01359
01379
01449
01485
01502
01728
01760
01842
01986
All other calls are national calls.
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