Three's Voice over LTE launch means better signal in more places
 

There's more than one way to wipe out a not-spot, and to compliment Three's inTouch app for WiFi calling, the carrier has today become the first in the UK to add Voice over LTE (VoLTE) support to its mobile network. Simply put, VoLTE -- or "4G Super...

http://www.engadget.com/2015/09/15/three-volte-launch/