I got a Samsung galaxy s4 for verizon and the SIM is from T-mobile. I can't get calling, texting or data to work without using global. Would that make my bill higher if I use global for texting and calling? And doesn't T-mobile and Verizon use CDMA so an unlocked Verizon phone should work right? When I go to the mobile network settings I can change the network mode from GSM/UMTS to LTE/CDMA and when I select LTE/CDMA it says searching for a network but never connects.
Read more: How to get a verizon phone to work with tmobile?