Fact: Why T-Mobile needs Wi-Fi calling: its network can’t match AT&T and Verizon http://bit.ly/1u4dYhy http://bit.ly/1u4dYhy

Fact: Why T-Mobile needs Wi-Fi calling: its network can’t match AT&T and Verizon http://bit.ly/1u4dYhy http://bit.ly/1u4dYhy