If you are experiencing issues with your SIM Card, we recommend trying the below troubleshooting:
Symptom: Handset reporting NO SIM or INVALID SIM
Step 1: Check that the SIM is inserted correctly as per the Mobile Manual
Step 2: If the SIM is inserted correctly and your handset is still reporting NO SIM, reboot your handset. Turn handset OFF – remove SIM Card for up to 5 minutes – reinsert SIM Card – turn handset ON.
Step 3: If above reboot does not resolve the issue, if possible, test your SIM Card in another handset as the coverage issues may be related to the handset and not the network.