T-Mobile drops your calls (both incoming and outgoing) so that you will have to repeat that call or the call will come in again so that they are able to round up your minutes and charge you for the extra time used.
This will increase your bill substantially and they will tell you that there is nothing they can do about it because it is the service in the area, blaming it on the telephone line. This is not true, they know it and so do most people but you can do nothing about it other than to write your congressional representatives.
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