My mobile phone is also a Japanese version with a card sticker. Someone pressed gpp and the phone showed no service. What should I do?

Possible reasons for displaying "No Service" and solutions:

1. Just turn off airplane mode. If the signal is weak, please consult the operator.

2. Not recognized (for example, a mobile phone uses a telecommunications SIM card)

3. Check the card slot for looseness, deformation or other poor contact, and send it for repair.

4. Restart the phone (if the battery is removable, it is best to remove the battery and restart)

5. Place the SIM card on another phone and test whether the SIM card is faulty.

6. Software or system reasons. To flash the phone, it is best to use the official ROM

7. If the phone has hardware failure, send it for repair.