Quick Answer When Dual SIM is not working, first check whether both lines appear in the phone’s cellular settings and whether each line is turned on. Confirm that the correct SIM is selected for calls, text messages, and mobile data. If one line is missing, test each SIM separately and contact the carrier about activation … Read more
Quick Answer When Android detects your SIM card but shows No service, Emergency calls only, or no signal bars, the SIM has been recognized by the phone but has not established normal service with the carrier network. Start by changing locations, checking for an outage, toggling Airplane Mode, restarting the phone, and confirming that the … Read more
Quick Answer When your phone displays No SIM, Invalid SIM, SIM Failure, or cannot connect to the carrier, first restart the phone and confirm that Airplane Mode is off. For a physical SIM, power the phone off and carefully reseat the card. Then test the SIM in another compatible phone or test a known-working SIM … Read more