It has been shown that the iPhone 5s can support Voice over LTE.
"According to a Twitter user “joe012594” who made a name for himself by creating carrier hacks, iOS 8 Beta 5 showed VoLTE as available on his iPhone 5s in CommCenter, which handles all cellular communication in iOS." Verizon begins rolling out Voice over LTE ahead of iPhone 6 announcement
VoLTE on iPhone 5s Carrier Hack (Verizon)
Carrier - VoLTE on iPhone 5s Carrier Hack (Verizon) | MacRumors Forums
I can't stand the size of the iPhone 6. It is too big to use as a phone.
I prefer the smaller size of the iPhone 5S but want the newer calling features that allow me to use data at the same time of making a voice call.
We all know Verizon has to support this. Why doesn't Verizon get behind this and start supporting it more so it better competes with that offered by other carriers, such as the GSM carriers that have always had this capability.