Telephone numbers beginning with 01420 belong to the Alton charge group.
The following numbers are local calls
to and from this charge group:
01252
01256
01428
01730
01962
The following numbers are regional calls
to and from this charge group:
0118
01243
01264
01276
01293
01306
01329
01344
01372
01403
01483
01488
01489
01491
01628
01635
01703
01705
01734
01753
01784
01794
01798
01895
01932
01980
01983
All other calls are national calls.
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