Fraunhofer IIS Demos FullHD Voice Over LTE On Android Handsets

Verizon Wireless has toyed with VoLTE (voice over LTE) before...

This particular method enables mobile phone calls to sound as clear as talking to another person in the same room, at a quality level that is equal to that experienced by consumers on any other audio/video device.

Source:
http://hothardware.com/News/Fraunhofer-IIS-Demos-FullHD-Voice-Over-LTE-On-Android-Handsets/