After the phone is updated, it shows no service, and the phone card has no service after the phone u

The phone doesn't recognize the SIM card.

Show No Service Processing:

1. Please confirm whether the SIM card type is correct according to the mobile phone model. An incorrect SIM card can damage the card tray and card slot or even fail to be removed;

2. Please make sure to use a standard SIM card. Do not use a non-standard SIM card or cut the card by yourself, cutting the card can easily cause the SIM card to be unable to recognize or damage the mobile phone, it is recommended to go to the business hall to change the original standard SIM card;

3. Please confirm whether the card is placed correctly. Whether the notch of the SIM card corresponds to the card slot;

4. Please confirm whether the surface of the SIM card is dirty. If the SIM card has been used for a long time, you can wipe the surface of the chip with alcohol, or go to the business office to replace the original standard SIM card. If the SIM card is used for a long time, the metal surface is easy to be oxidized, which is easy to cause probabilistic card recognition;

5. Do not plug or unplug the SIM card when the device is turned on. After inserting the SIM card, please restart your phone and try;

6. If the problem still exists, please back up the data in advance and bring the purchase invoice to the after-sales service point for maintenance.

If there is no signal on your phone or an emergency call prompt is displayed on the screen, it is recommended:

2.If it is a dual-SIM phone, please check whether the SIM card is activated: Settings - SIM Manager - SIM1 SIM2 - Click the SIM card icon - slide to turn on (the operation mode may be slightly different for different models of mobile phones).

3.If there is still no signal, it is recommended to turn off the SIM card and remove it, wipe the SIM card chip with an eraser, and then reinstall it.

4.If it doesn't work, try to change to another location to rule out whether it is caused by poor signal coverage in your location.

5.Try to change the network mode to 3G or 2G (do not select the auto-connect mode). Note: Some machines do not support changing the network mode.

6.Try to change another SIM card.

7.Update your phone's system version: Settings - About Phone (About Device) - Manual Update Automatic Update (Software Update System Update - Update). Note: Please back up the data (contacts, messages, **, etc.) in your device before upgrading.

If there is still no signal or emergency call is displayed after the above operations, please bring the purchase invoice, warranty card and machine to the nearest service center for inspection.

If you have any other questions, you can enter the OPPO enterprise platform to ask customer service questions!

Hello. Is it a Xiaomi phone?

If you have backed up your data before, or there is no data in your phone that needs to be backed up, it is recommended that you try to enter recovery (turn off, press and hold the volume up + power on button to enter recovery mode) to clear all data, do not restore data for the time being after booting, see if it can solve the problem, if it still can't be solved, it is recommended that you try to brush the line to the latest development version.

Please flash according to the flashing tutorial, and the sixth way is line brushing:

Shut down and restart to try, I updated the system this morning, shut down and restarted, everything is fine.

1. Shut down and restart the phone, re-search the current network, 2. Remove the SIM card after shutting down, use the eraser to wipe the SIM card, re-attack and insert the SIM card to turn on 3. Insert your mobile phone card into another mobile phone, if it also shows that no service is the reason for the SIM card, it is recommended to go to the operator to replace the card again; 4. Insert another new SIM card into this mobile phone, if the display is abnormal, it is recommended that the customer service center detect and deal with the machine failure. 5. If the signal coverage of the current regional network operator of the mobile phone SIM card is poor, you can consult the signal coverage of the local operator or whether the local network has changed.

1. The mobile phone card cannot be used.

2. Poor contact with mobile phones.

3. The location is caused by the signal blind area or the sudden lack of signal. If the mobile phone card shows no service, you can check whether the mobile phone card can be used, start the airplane mode of the mobile phone, and restore the mobile phone to factory settings.

Taking Huawei Mate10 mobile phone as an example, the method of factory reset the mobile phone is as follows:

1. First of all, click the settings button on the desktop of your phone after the backup is done.

2. In the pop-up interface, we click on the system at the bottom.

3. In the pop-up interface, click Reset.

4. In the pop-up interface, click Factory Reset.

5. The pop-up interface, click to reset the phone.

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. The SIM card of the mobile phone is in poor contact with the shneme of the mobile phone card slot, resulting in the failure of the SIM card circuit and the inability of the mobile phone to communicate with the network base station.

2. The mobile phone is incompatible with the system due to the application software for installation, resulting in the system software closing the modem in the mobile phone signal processing circuit, at this time you can turn off the mobile phone and then restart, the modem in the mobile phone signal circuit will be restarted, and after 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.

As you mentioned, there may be the following reasons why your phone is out of service:

1. The SIM card is damaged. If your SIM card chip is worn or broken, the SIM card may not work properly in the phone, and you can replace the SIM card.

2. Mobile phone terminal failure. If your mobile phone is flooded or accidentally dropped, your mobile phone may be damaged, you can try again by replacing the mobile phone terminal.

If there is no signal and no mobile phone card, it will show no service, first check whether the mobile phone card is reversed.

The reasons for this are as follows:

First, the network signal is too poor, you can try it in another place.

2: The mobile phone card is stopped or scrapped or not opened, go to the business hall to ask 3: the network is not refreshed, restart the machine to try to see.

Fourth, the SIM card is not inserted well, try to reinsert the card.

Fifth, the hardware problem of the mobile phone can only be sent for repair.

Please check if the SIM M card is loose?