Hello there customer12345679,
Thank you for your interest in the LG Optimus G Pro, I’ll be happy to help!
I have researched the LG and found no mention that it is HD voice compatible. The device was released back in 2013, prior to HD voice being launched.
Check out https://www.att.com/shop/wireless/devices/smartphones.html to view all the HD voice compatible devices that AT&T currently offers.
Hope this helps!
Rocco, AT&T Community Specialist
Date published: 2016-08-03