At its Uncarrier 5.0 event, T-Mobile today announced “Test Drive,” a new service that will let customers_check the quality of the carrier’s network on an iPhone 5s for seven days. The program kicks off on June 23. After the seven days, you’ll need to drop off the phone at a T-Mobile store, but you won’t have to put any money down for the test. T-Mobile announced new progress with its Wideband LTE and Voice over LTE (VoLTE) services. The company plans to offer full national VoLTE coverage in the US by the end of the year. T-Mobile’s Uncarrier strategy has...

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