I got back from Asia and bought a couple GSM SIM cards from PureTalk USA for my wife and me. Unfortunately, her Nokia 1616 didn't work, so we got an "unlocked" XT610. When I put the SIM card in and try to call, however, the phone forwards me to a Verizon operator. I can switch to the global mode or the GSM mode, but no matter what I try, sending a text or trying to call, I get rerouted to Verizon. Any ideas on how to make this work??