Switching wireless providers only to find that you don't get your new carrier's signal in your living room is the pits. T-Mobile is helping residents of Boston, Massachusetts; Austin, Texas; and Atlanta, Georgia avoid that particular pickle by offering 30-day trials of its wireless service. Prospective customers in those three locales can request a portable Wi-Fi hotspot loaded up with a T-Mobile SIM that's theirs to use for up to a month or 30 gigabytes of data use.
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