How can I cancel LTE Voice/Data and Advanced Calling?
MSLS,
Being able to manage the features of your phone is a must. The good thing is that disabling HD Voice is really easy to do from the settings of your phone. To do so go to Settings > Cellular > Enable LTE > Data Only to disable. Here are more details about the HD Voice service http://vz.to/1X4sSDq .
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If you have no option to do so under your phones call settings you can call CS or visit your account page online to remove the feature.
Just do it on the phone as VZW rep points out above, then you can turn it on and off as you wish. Remember, when it is off, you can't surf and talk at the same time if not on wifi.