Why didn't they just start with VoLTE?
Lots of technical issues apparently. 911, call handoffs, etc.
They should probably get 100% of existing footprint to LTE before rolling out VoLTE. Might be difficult to do CDMA/VoLTE handoffs.Unless VZW/Sprint plan to stay with CDMA forever, they'll eventually have to get to VoLTE. CDMA will still probably be around about another 10 years or so either way.
With all the problems they've had with their LTE network, I'm very glad they choose to delay VoLTE, wait until the network is complete and they don't have to worry about LTE to cdma handoff's which as a current lte user can be rocky sometimes.
it's not as simple as flicking a switch...it's basically a whole new voice network IIRC