three launch 4G Super-Voice VoLTE in UK
three launch 4G Super-Voice VoLTE in UK
you can buy a new VoLTE phone
http://www.three.co.uk/Discover/network/4G-Supervoice
install an app on certain LG and SONY androids
http://support.three.co.uk/SRVS/CGI-BIN/WEBISAPI.DLL?Command=New,Kb=Mobile,Ts=Mobile,T=Article,varset_cat=internetapps,varset_subcat=3585,Case=ext%28EM73515%29
or use VOIP over WiFi instead with three in touch