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T‑Mobile President and COO Mike Sievert, right, and CTO Neville Ray answer a caller’s questions during the T‑Mobile Q4 2018 Earnings Call on Thursday, Feb. 7, 2019 in Washington. T‑Mobile delivered record‑low Q4 postpaid phone churn of 0.99% – the best result for a fourth quarter in T‑Mobile’s history. (Kevin Wolf/AP Images for T‑Mobile)