The mobile phone has a mobile phone card but shows no service.

Mobile phone communication sends and receives signals through network base stations, and then communicates with the called party. If the mobile phone shows no service, it may be related to the following situations:

1. The mobile phone SIM card and The shrapnel of the mobile phone card slot has poor contact, causing the SIM card circuit to not work, and the mobile phone to be unable to communicate with the network base station. At this time, you can remove the SIM card, wipe the gold finger of the SIM card with a clean cotton cloth, and then reinstall it.

2. The application software installed on the mobile phone is incompatible with the system, causing the system software to shut down the modem in the mobile phone signal processing circuit. At this time, you can turn off the mobile phone and then restart it, and the modem in the mobile phone signal circuit will restart. , after the signal is normal, delete the suspicious mobile application software installed before the problem occurred.

3. The mobile phone SIM card is not registered in the network. At this time, you can insert the SIM card into another mobile phone. If it also displays no service, it is due to the SIM card.

4. Due to accidental reasons, the SIM card of the mobile phone failed to reconnect to the search network and register after there was no signal in the network signal coverage area. At this time, you can manually restart under the Settings-General-Network-Network Operator menu. Search network registration.

5. The reason why the mobile phone SIM card network operator's signal is not covered. At this time, you can change the location to an open area, and then check the mobile phone signal grid display. If the display is normal after changing the location, you can call the network operator. Call the service hotline for feedback and complaints.

6. If the phone card has been used for too long, you can go to the local business office to apply for a new card with a valid ID.