Your phone might be SIM locked to a network operator. You're then not allowed to use SIMs from other operators. Follow these instructions to find out your SIM lock status.
Step 1 of 1
View SIM lock status
Insert a SIM from another operator and turn on your phone. If your phone is SIM locked, a message will appear on the display.
View SIM lock status
Insert a SIM from another operator and turn on your phone. If your phone is SIM locked, a message will appear on the display.