At its Un-Carrier 5.0 announcement/pep rally yesterday, T-Mobile US announced it expanded Voice over LTE (VoLTE) coverage to 15 total markets reaching 100 million people. It also says it dedicates nearly 24 Kbps to VoLTE calls for the “highest fidelity” and added VoLTE support for the Samsung Galaxy S 5.
T-Mobile CTO Neville Ray detailed new VoLTE cities and areas in a blog post yesterday. Atlanta, GA, Austin, TX, Boston, MA, Chicago, IL, Dallas, TX, Houston, TX, Long Island, NY, Los Angeles, CA, Minneapolis, MN, all of the state of New Jersey, New York, NY, Philadelphia, PA, San Francisco, CA, and Washington DC join the first rollout city of Seattle, WA.
Ray said T-Mobile offers the “highest fidelity HD voice possible” by providing 23.85 Kbps to the AMR-WB codec, the max rate the codec supports. Other carriers have not said how much bandwidth they dedicate to VoLTE calls, but one might imply AT&T may not be using the full rate.
Other statements made by Ray in the blog post include “zero to nationwide LTE in under nine months,” the first company to launch Wi-Fi calling, and the first to launch nationwide HD voice.