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:
01380 01381 01382 01383 01384 01386 013872 013873 013874 013875 013876 013877 013878 013884 013885 013886 013887 013888 01389
If the number you are interested in is not shown, it is not a geographical number or is non-existent.
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