https://www.cnet.com/news/could-t-mobiles-success-doom-its-merger-with-sprint/ >T-Mobile's success could be its undoing as it tries to convince regulators to approve its $26 billion bid to buy Sprint. >The Seattle-based mobile carrier continued its run in adding new customers in the first quarter of 2018. On Tuesday the company announced it gobbled up 617,000 postpaid phone subscribers -- people who pay their bills at the end of the month-- during the quarter that ended in March.