AT&T has said that it will support the iPhone 5's HD Voice technology sometime later this year. The technology will roll out along with AT&T's switching over to routing voice over LTE. "HD Voice is part of our voice over LTE strategy," AT&T senior VP Kris Rinne said.
T-Mobile, on the other hand, will support the iPhone 5's HD Voice technology right from the start. When the device launches, T-Mobile users will be able to experience the higher quality audio that some have called a noticeable improvement. Sprint is also considering implementing HD Voice technology.