With T-Mobile's (NASDAQ: TMUS) shares down 15% over the past 12 months, the market is presenting investors with an entry point. That's because there are a number of catalysts that could help the wireless carrier rebound to new highs in the coming year. Specifically, here are three reasons why you may want to consider buying T-Mobile stock today.The first quarter of 2018 marked the 20th consecutive quarter T-Mobile added more than 1 million net customers, and its 17th straight quarter of industry-leading growth. The company continues to disrupt the massive U.S.