Telephone numbers beginning with 01777 belong to the Retford charge group.
The following numbers are local calls
to and from this charge group:
01302
01427
01522
01623
01636
01909
The following numbers are regional calls
to and from this charge group:
0114
0115
01226
01246
01400
01405
014304
01433
01476
01526
01529
01629
01652
01673
01709
01724
01757
01773
01949
01977
All other calls are national calls.
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