Telephone numbers beginning with 01661 belong to the Wylam charge group.
The following numbers are local calls
to and from this charge group:
01207
014346
01670
01830
0191 (numbers beginning 2, 4, or 6)
The following numbers are regional calls
to and from this charge group:
01325
013884
013885
013886
013887
013888
01429
014342
014343
01665
01669
01740
01833
0191 (numbers beginning 3 or 5)
All other calls are national calls.
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