iphone 6 and iphone 6 plus users that are on the Verizon and T-mobile networks will be able to activate HD voice in a few easy to follow steps. Both T-Mobile and Verizon currently offers nationwide VoLTE (Voice over LTE) service with improved audio quality. Other networks such as AT&T also has limited HD voice services, but it is not widely accessible at the moment and is only available from Illinois, Wisconsin, Indiana, and certain parts of Minnesota. At the moment, the Sprint network does not currently offer VoLTE service for iphone.
If you would like to activate Advanced Calling 1.0, first you will need to log on to your Verizon account, then go to the “Manage My Account” menu, click on “Change Features”, then choose “Add Advanced Calling”, from there you should be able to set it up to activate your HD voice. However, there are a few problems with HD voice as the VoLTE service is still fairly new and not widely accessible to all devices and networks, which means that you will experience frequent dropped calls if you leave the 4G LTE area, or you might experience problems connecting to another device that is not compatible. If you leave the 4G LTE area the connection will be too weak to hold the call and you will be disconnected from the call. It appears that both users will only be able to use HD voice if both callers are using VoLTE ready phones on the same carrier, such as two Iphone 6 users on Verizon’s network.
As time and technology progresses you can expect to see more VoLTE ready phones hit the market as 4G LTE service becomes the new standard for nationwide HD calling.