T-Mobile US says its new “Enhanced Voice Services” (EVS) will improve voice call reliability in areas of weaker signal, while providing voice quality even higher than HD Voice.
EVS works whether on Wi-Fi and the T-Mobile LTE network, providing audio quality benefits when customers are talking to other parties that do not have EVS-compatible devices.
EVS appears to use a different and new codec than T-Mobile US orginially introduced to support Voice over LTE services.
The LG G5 is EVS-capable right out of the box. The Samsung Galaxy S7 and S7 edge support EVS through a software update happening the week of April 3, 2016.
EVS also should be available on seven T-Mobile smartphones by the end of 2016.