Telephone numbers beginning with 01556 belong to the Castle Douglas charge group.
The following numbers are local calls
to and from this charge group:
013872
013874
013875
013876
013877
013878
01557
01644
The following numbers are regional calls
to and from this charge group:
01461
01576
01659
01671
01683
016973
01848
01900
019465
019466
019468
01988
All other calls are national calls.
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