Verizon has started rolling out a new update to Samsung Galaxy S6 and S6 edge units on its network. Carrying a software version of VRU4CPH1, the update brings along improvements related to Wi-Fi calling and HD Voice. Here's the complete change-log: Fewer dropped Wi-Fi voice calls Video calls using a cellular network will start with a pop-up reminder that you'll be using data Ensures you can only make HD Voice Calls when connected to the 4G LTE network Improvements to HD Voice Call volume You can now register for Voice over Wi-Fi calling when roaming As is...
Source: http://www.gsmarena.com/new_verizon_galaxy_s6_s6_edge_update_brings_wifi_calling_and_hd_voicerelated_improvements-news-20004.php