For more information about the charge group a number is in, and what groups it is local to, find the first few digits in the following list:
01690 01691 01692 016932 016936 016937 016938 01694 01695 016973 016974 016977 016978 01698
If the number you are interested in is not shown, it is not a geographical number or is non-existent.
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