It sounds like you’ve already taken some fantastic steps in the right direction, askrana. HD Voice, also known as Advanced Calling or VoLTE, is the setting that you’d need to have on in order to place a phone call over LTE signal when it’s available. The way you dial will not change, and there’s also a fantastic guide at https://www.verizonwireless.com/support/samsung-galaxy-s7/simulator/?CID=feature_calling_hd#FEATURE_... to help you through placing an HD Voice call. When you follow those steps, what happens? Before placing the call, what type of signal do you see (4G LTE, 3G, 1x)?
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