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:
01501 01502 01503 015042 015043 015044 015046 015047 015048 01505 01506 015072 015073 015074 015075 015076 015077 01508 01509
If the number you are interested in is not shown, it is not a geographical number or is non-existent.
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