T-Mobile US is having a banner year. The “uncarrier” has again increased its annual earnings outlook, supported by the acquisition of fiber network operator Metronet and strong mobile customer growth in Q2. After gaining another 1.73 million postpaid customers in the quarter, T-Mobile now expects total postpaid net additions this year of 6.1-6.4 million, up from its previous guidance of 5.5-6.0 million. Postpaid customer growth strengthened compared to the first quarter and included 83...