Telephone numbers beginning with 01591 belong to the Llanwrtyd charge group.
The following numbers are local calls
to and from this charge group:
01550
01597
01874
01974
01982
The following numbers are regional calls
to and from this charge group:
01267
01269
01495
01497
01544
01545
01547
01558
01559
01570
01639
01685
016864
016866
016868
01873
01970
All other calls are national calls.
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