Why does my iPhone always show no service after installing the card!

Mobile phone communication is to send and receive signals through the network base station, and then communicate with the called party, such as the mobile phone shows no service may be related to the following conditions:

1. Mobile phone SIM card.

Poor contact with the shrapnel of the mobile phone card slot, resulting in the SIM card circuit can not work, and the mobile phone and the network base station can not communicate, at this time, you can remove the SIM card and wipe the SIM card gold finger with a cleaning cotton cloth.

, reinstall it.

2. The application software for the installation of the mobile phone is not compatible with the system, resulting in the system software turning off the modem in the mobile phone signal processing circuit.

At this time, you can turn off the phone and restart it, the modem in the mobile phone signal circuit will restart, and when the signal is normal, delete the suspicious mobile phone application software installed before the problem.

3. The SIM card of the mobile phone is not registered in the network, at this time, you can insert this SIM card into another mobile phone, if it also shows no service as the reason for the SIM card.

4. If the SIM card of the mobile phone is accidental, and there is no signal in the network signal coverage area, it fails to reconnect to search the network and merge the book, at this time, you can manually search for network registration under the menu of Settings - General - Network - Network Operator.

5. If the signal coverage of the mobile phone SIM card network operator is not available, 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 service ** for feedback and complaints.

6. **The card has been used for too long, and with a valid certificate, you can go to the local business hall to reapply for a card.

Displays the possible causes of "no service" and how to solve them

1.In airplane mode, turn it off. or the signal is weak, consult the operator.

2.Not recognized (such as mobile phone using telecom SIM card)3Check whether the card slot has loose and deformed contact defects, and send it for repair.

4.Restart the phone (if the battery is removable, it is best to remove the battery and restart) and put the card on another phone to test whether the SIM card is faulty.

6.Software or system reasons. To flash the machine, it is better to use the official rom7If the hardware of the mobile phone fails, send it for repair.

Answer 1: If the mobile phone is in airplane mode, you need to turn off the airplane mode; 2. If the SIM card of the mobile phone is in poor contact with the shrapnel of the mobile phone card slot, you can remove the SIM card, wipe the golden surface of the SIM card with a cleaning cotton cloth, and reinstall it; 3. If the SIM card fails to reconnect to the search network and register after there is no signal in the network signal coverage area due to accidental reasons, you can enter [Settings] - [General] - [Restore] - [Reset Network Settings]; 4. If the SIM card is not registered in the network, you can insert this SIM card into another mobile phone, if it also shows that no service is the reason for the SIM card; 5. If the SIM card network operator's signal coverage is not available, you can change the location to an open area, and then check the mobile phone signal grid display.

If you see a message that says "Cellular update failed: iPhone won't be able to make and receive** or access cellular data until the update" after updating your iOS system or restarting your device, iOS diagnostics have detected a problem on your device that needs to be serviced.

"No Service" is displayed, the cellular network shows "Error", the device says "No Service", and the cellular network is displayed "Error" with "Need to update to use cellular data on this iPhone". As shown in Fig

Some versions of Pingguo phones do not recognize the network.