Originally Posted by Rukbat
LTE is the 4G data protocol it uses, Verizon uses CDMA for voice, TMobile uses TDMA(GSM) for voice. The two don't mix. And since logging into the network is done on 2G (voice), regardless of the high speed data protocol the phone or the network use, if the phone can't talk to the network on 2G to connect to the network, the phone won't work on that network.
Cant really disagree with you because you sound like you know better than me. I just thought if you unlock a phone it could be used on any carrier. I was also pretty sure after I went to more settings and under mobile networks it lets you change network mode from Global, LTE/CDMA and GSM/UMTS so idk.