The carrier said the service is available for existing LG G Flex, Samsung Galaxy Note 3, and Galaxy Light users.
T-Mobile subscribers who own those phones need to update to the latest software to start using VoLTE.
According to T-Mobile’s CTO Neville Ray, the new technology will allow “faster call setup times (almost twice as fast as a non-VoLTE call setup) and the ability to enjoy lightening fast LTE data speeds while on a call.”
”VoLTE calls will be carried over IP on our LTE network instead of a circuit-switched path on our 4G HSPA+ network. This is advantageous because your phone stays on our wicked fast LTE network to make a call. The tricky bit in all this is the smooth mobility between our various radio layers. Enhanced Single Radio Voice Call Continuity (eSRVCC) is a new LTE Advanced function and we’re excited to be the first to deploy it in the U.S. All of this basically helps ensure that your capable phone won’t drop a call if you leave an LTE area and it switches to 4G HSPA+ or 2G coverage,” Ray explained.
Last week AT&T rolled out voice-over-LTE for a few market areas in the U.S.
Calls over LTE isn’t currently supported on iOS but the iPhone 6 and iOS 8 are expected to complement each other to support VoLTE calls.