Home / GSM ARENA / GSMArena.com / T-Mobile is growing up under CEO Sievert and the days of "Dumb and Dumber" are over T-Mobile is growing up under CEO Sievert and the days of "Dumb and Dumber" are over Sunday, 1 August 2021 GSM ARENA GSMArena.com T-Mobile is giving up the practice of making fun of its rivals now that it has become a legitimate leader in delivering 5G service to customers in the U.S. Share on FacebookTweet on TwitterPlus on Google+ Posted by Charles Mangya
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