Telephone numbers beginning with 01436 belong to the Helensburgh charge group.
The following numbers are local calls
to and from this charge group:
01301
01360
01369
01389
01475
The following numbers are regional calls
to and from this charge group:
01236
01294
01355
01357
0141
01499
01505
01546
01560
01563
01698
01700
01786
01838
01852
01866
01877
01880
All other calls are national calls.
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