Originally Posted by
superlawyer15 On Verizon I could talk on the phone and surf on lte
Its not a volte issue
You don't need the voice call routed on lte to use data on lte
VoLTE has not been implemented on any network in the USA. On Verizon phones, calls and text are routed through their CDMA network and since you can't talk and use data simultaneously on CDMA, Verizon phones route the call through CDMA and keep the LTE radio active for data use, hence the reason for a sim card on Verizon phones. GSM phones work differently in that the radio disables LTE and routes voice and data through 3G. 3G allows for simultaneous voice and data so it's not an issue with GSM phones.
Edit: Sorry... Verizon does have VoLTE but I'm not sure if any devices actually support it yet.