When I go to certain areas that the coverage map shows I should clearly be able to make phone calls I get no bars and cannot call or text. This was on a Nexus 6p, which they said was the problem. So I got a T-Mobile branded phone( lg k7) and still can't do anything. Is the map wrong or what could be the problem? I am a new customer but won't be for long if i can't resolve this!

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