chamando de México

pode chamar os Estados Unidos do México e não têm uma carga excedente se ambos os telefones estão com a & t

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If you're in Mexico that would be considered roaming, so you would be charged roaming fees. The cost depends on what plan you have. Mexico and Canada are usually cheaper per min though.

Yeah, you'll need to get an international plan for the time you are there. That's what my mother did when she went out of the country on a cruise. She got international minutes for the time she was gone, and it was a lot cheaper than roaming fees.