Is LTE on the Nexus for data only? Or does Verizon send voice over it as well? I've been doing some Googling and all I can find is Verizon was testing VOIP over LTE and then some other articles that right now LTE networks fall back to 2G/3G for voice calls. Basically I'm trying to find out if I lose anything other than data speed by turning off 4G when I don't need insane data speeds.