About SIM card without service??!! 20

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.

What should I do if the mobile phone card shows no service?

I think there are several possibilities: the SIM card slot is broken, or the pins that read the SIM card are broken. There may be a problem with the phone and the signal is damaged. For example, the mobile phone fell to the ground and the signal was missing.

There's something wrong with the SIM card slot, do you see if those pins are broken?

Can't read the card at all?

The SIM card of the mobile phone is in poor contact with the shrapnel of the mobile phone card slot, resulting in the failure of the SIM card circuit, and the mobile phone cannot communicate with the network base station.

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

Signal blind spots, such as in elevators, or some very remote corners, there will be no service, but sometimes after returning to the normal signal area, the mobile phone can not automatically search for signals, so you need to manually restart or turn on the airplane mode and then turn off to re-search for the received signal. **Poor card contactIf you often plug and insert **card, the metal chip on the **card may be in poor contact with the mobile phone, resulting in the mobile phone occasionally having no signal. In addition, the SIM card location is easier to enter the dust, occasionally or need to accompany the sale of the cleanup, if your ** card is to cut the card yourself, it may be that the card is cut incorrectly resulting in no service.

1.Please check the SIM card.

1) If your SIM card is a manually cut card, there may be signal problems due to non-standard shape and poor contact, it is recommended that you bring your personal ID card to the operator's business office to apply for a standard SIM card.

2) Dirty or oxidized SIM card will also lead to poor contact, it is recommended that you keep your SIM card clean.

2.Please avoid interference from metal or magnetic materials.

If your mobile phone uses a special metal protective case, or you are in an elevator, car and other environments, it is recommended that you remove the mobile phone protective case or leave the elevator, car and other environments, metal and magnetic materials are easy to interfere with the signal, resulting in no service for the mobile phone.

3.Please rule out network causes.

1) Make sure you are in a good environment.

In some more enclosed indoor environments, such as buildings with dense spacing, cell phone signals may be blocked, resulting in no service.

The degree of network coverage of carriers varies according to different regions, and some areas may have insufficient coverage capacity, resulting in no mobile phone service.

If your mobile phone does not have remorse service in a specific area, or if your friends use the same carrier** card in the vicinity also have no service, it may be caused by the poor network quality in your location, and you can return to normal after changing to another place.

2) Please restart your phone or switch on and off the Yuyu airplane mode.

Special configurations of some networks may cause your phone to be out of service, which can be restored after restarting your phone or turning on airplane mode.

3) Please reset the APN

Open Settings, enter APN in the search bar at the top, tap Access Point Name (APN) to jump to the mobile data settings interface, tap Access Point Name (APN) again, then tap Three Dots or Four Dots in the upper right corner, and select Reset to Default Settings to try.

4) Please reset the network settings.

4.Please update your phone system to the latest version.

If your phone is still out of service, contact Huawei Consumer Service** (950800) for more assistance, or back up your data in advance (third-party apps such as QQ and WeChat need to be backed up separately), bring your purchase voucher, and go to a Huawei Customer Service Center near you.

Make an appointment for service. Repair spare parts** inquiry.

Huawei Customer Service Center.

1.Scroll down the status bar to see if the airplane mode switch is on. If on, turn off airplane mode;

2.SIM card "Enable" switch is off, if it is off, click to turn on this switch to make the SIM card enabled; Fiber made.

Path: OS12: Settings > Mobile Network >> Select a SIM card > the "Enable" switch.

OS11 and below: Settings > SIM & Data Management > Select a SIM card > the "Enable" switch.

3.The 5G switch is on;

Path: ColorOS 12: Settings > Mobile Networks >> Select a SIM card > Network Settings > Enable 5G

ColorOS 11 and below: Settings > SIM & Data Management > Select a SIM card > Network Settings > Enable 5G

5.Insert another SIM card to confirm whether the same phenomenon occurs;

If other SIM cards are normal, it may be that the SIM card itself is faulty, and you can consult the operator's business office to replace the SIM card.

If other SIM cards are not normal, you can back up the data first, and then check whether it is restored in Settings > System Settings > Reset Phone > Reset All Settings Items.

6.If it has not been restored, select after confirming that all important data has been backed up (the data of the safe and QQ WeChat needs to be backed up and migrated separately)."Erase all data completely" ；

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.

Above, for reference.

It may be that the SIM card is broken, just go to the business hall to get a replacement one.

Go to the business hall to change your card.

There are several reasons for this:

First, the SIM card and the mobile phone are not matched enough.

Second, there is no operator network service in the area where the mobile phone is located;

3. The SIM card is damaged or has poor contact;

4. The mobile phone signal is interfered with by other electronic devices;

5. Caused by poor contact between the SIM card and the card slot.

Usually in this case, you can change your location and use someone else's available SIM card to install it on your mobile phone to test the imitation annihilation test.