T-Mobile’s various “Uncarrier” initiatives have done an unbelievable job of drawing new business to the nation’s No. 4 wireless carrier. The scrappy company actually managed to outpace its giant rivals in net subscriber additions, which is a scenario most industry watchers would have laughed at a few short years ago. As it turns out, however, one of T-Mobile’s most widely covered Uncarrier moves has brought about a new problem, and it has caused one used gadget buying service to reject all future attempts from potential customers looking to sell T-Mobile handsets.
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