I am in Spain. I asked Sprint to SIM unlock my phone before I left and they said it worked but it did not. I bought a movistar SIM and all I get is 'no service.' Under Cellular+SIM options, it is in CDMA only mode and the option to change it is greyed out. I was in 8.1 so I flashed to 8.0.10328.78 and called Sprint. They want me to update my network profile to send the command to unlock it but it isn't working over WiFi.
The phone knows that the SIM is there, I can access the SIM applications, read the SIM ID and when I turn on the phone with it inserted it says 'switched to CDMA only.' So I think it is still SIM locked. Is there a way I can unlock it? I've never had to deal with this before.