How does the mobile phone card not show the network, the mobile phone card does not display, what s

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.

There are many more reasons, but the most common is that you don't have to spend it

Answer: The SIM card circuit cannot work due to poor contact with the shrapnel of the mobile phone card slot, and the mobile phone cannot communicate with the network base station.

2.The application software installed on the mobile phone is incompatible with the system, causing the system software to close the modem in the mobile phone signal processing circuit, at this time, the mobile phone can be turned off and then restarted, 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.If the card slot is damaged, it is recommended to bring the mobile phone to the designated repair service center for inspection and repair.

What should I do if my phone doesn't recognize the SIM card? Don't go to a mobile phone store, try these methods now!

After the steps such as restarting the mobile phone and reinserting the card are useless, find a mobile phone to confirm whether the SIM has been broken, if it is still unresponsive on other mobile phones, the card is broken, and it needs to be remade after the steps of restarting the mobile phone and reinserting the card, find a mobile phone to confirm whether the SIM has been broken, if it is still unresponsive on other mobile phones, the card is broken, and the card needs to be replaced from the new. Card. After the steps such as restarting the mobile phone and reinserting the card are useless, find a mobile phone to confirm whether the SIM has been broken.

After the steps such as restarting the mobile phone and reinserting the card are useless, find a mobile phone to confirm whether the SIM has been broken.

1. If there is a fault in the SIM card of the mobile phone, you can try to insert the SIM card into another mobile phone, if it can be displayed normally, then it proves that there is no problem with the SIM card itself.

2. If the contact of the SIM card chip of the mobile phone is poor, and if you encounter this problem, it is recommended to send the mobile phone to the after-sales service for maintenance;

3. If the SIM card tray of the mobile phone is not fully inserted into the mobile phone, check and make sure that the SIM card tray is completely inserted into the mobile phone and there is no part left outside.

If your phone can't read the card or the SIM card can't be detected, there may be one of the following situations:

1. The contact between the metal contacts of the mobile phone card and the mobile phone is insufficient.

Second, the mobile phone card is damaged.

3. Whether the location is a signal blind area or suddenly no signal.

Fourth, you can try to put the card on other mobile phones to try, and judge whether it is a problem with the card or the mobile phone through the method of changing the card and changing the phone.

1. Restart your phone and try.

Please restart the phone, the phone will re-read the SIM card to see if it can be restored.

2. Check your phone's settings to see if the SIM card is enabled.

Go to Phone Settings - Mobile Network Dual SIM & Mobile Network - SIM Card Information & Settings - Click to enter the corresponding SIM card Enable the SIM card and make sure the switch is on.

3. Check whether the SIM card is installed backwards

Please refer to the card installation steps in the user manual to check whether the SIM card is loaded in the correct direction.

Go to Settings - System Management My Devices - Customer Service - User Manual - Phone Overview and Quick Start - Installation and Preparation to learn how to install memory cards and SIM cards.

Note: SIM card 1 and SIM card 2 are installed in the same way.

4. Check whether the SIM card looks good.

Observe whether there are stains on the metal surface of the SIM card, clean the stains on the surface of the SIM card, and avoid the SIM card being unrecognized due to poor contact. If you use a cropped SIM card, the SIM card shape may not be standard, resulting in poor contact and the SIM card cannot be recognized, it is recommended to go to the operator's business office to replace it with a standard SIM card.

5. Dual telecom cards need to use the VoLTE network

If two telecom cards are used at the same time, the secondary card (non-data card) needs to activate the VoLTE service and be within the coverage of the VoLTE network before registering the network.

6. Cross-validation.

Please install the SIM card on other devices, or install other SIM cards on the mobile phone for comparison and testing to determine whether it is a SIM card failure. If the SIM card itself is a problem, it is recommended to go to the operator's business office to replace the SIM card.

g The impact of 3G network withdrawal

At present, operators' 2G 3G networks are gradually being withdrawn, and the use of 2G 3G networks by auxiliary cards of some models may be restricted.

8. Service center testing.

If the SIM card icon does not recognize appears in the status bar above your phone, it means that your SIM card is not recognized, please follow the steps below to rule out whether the SIM card is recognized

1.Please restart your phone and try.

It is recommended that you restart your phone and let your phone re-read the "SIM card" before trying.

2.Please observe whether the SIM card looks good or not.

1) Observe whether the metal surface of the SIM card is dirty, clean the dirt on the surface of the SIM card, and avoid poor contact that causes the SIM card to be unrecognized.

2) If you are cutting your own SIM card, it is likely that the SIM card cannot be recognized due to the non-standard shape of the SIM card and loose installation in the card tray, resulting in poor contact. It is recommended that you bring your ID card to the nearest operator's office to change the standard SIM card.

3.Please test whether the SIM card can be used normally.

If your SIM card is not recognized on other mobile phones, or if other SIM cards are recognized on your mobile phone, it is likely that your SIM card is malfunctioning, and it is recommended that you bring your ID card to the nearest operator's business office to replace the standard SIM card.

4.Please check if the SIM card is placed in the corresponding card slot.

Some mobile phones only support a single SIM card, the inside of the card tray is the NM card slot, and the outside is the SIM card slot, please refer to the logo on the card tray frame to put the card, the SIM card and the NM card will not be recognized if the card is placed incorrectly.

If the problem persists after attempting the above methods, we recommend that you back up your data in advance (third-party applications such as QQ and WeChat must be backed up separately) and bring the relevant purchase voucher to a Huawei customer service center near you.

Make an appointment for service. Boarding service.

Repair spare parts** inquiry.

Hello, dear <>

I'm glad to answer for you: Why does the mobile phone show no network when the card has been inserted? A: It may be related to the following situations:

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 software due to the installation of the Gao Li brother application software, which causes the system software to close 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 disturbance signal is normal, delete the suspicious mobile phone application software installed before the problem.

Summary. The mobile phone card has no network signal, which may be 1, network problem or network cannot be covered. When the network coverage is not good, it is generally located in mountainous areas, basements, elevators, and when there is shielding or signal interference, there will be no signal or very weak.

In the process of debugging, optimization and maintenance, the network may also cause signal instability, and the general network will return to normal, and the mobile phone signal will return to normal. 2. Problems with the mobile phone itself. There may be a problem with the receiver and SIM card slot of the phone.

You need to go to the repair point to have a look. Of course, the factor of SIM card corruption cannot be ruled out.

Friends, I really don't understand, you can be more specific.

The mobile phone card has no network signal, which may be 1, network problem or network cannot be covered. When the network coverage is not good, it is generally located in mountainous areas, basements, elevators, and when there is shielding or signal interference, there will be no signal or very weak. In the process of debugging, optimization and maintenance, the network may also cause signal instability, and the general network will return to normal, and the mobile phone signal will return to normal.

2. Problems with the mobile phone itself. There may be a problem with the receiver and SIM card slot of the phone. You need to go to the repair point to have a look.

Of course, the factor of SIM card corruption cannot be ruled out.

Reasons and solutions for mobile phone card not being displayed:

1. The mobile phone card has poor contact or is not inserted well.

Generally, the SIM card will be placed in the card slot, but sometimes because the mobile phone accidentally fell or touched, the card moved in the position, resulting in poor contact between the card and the mobile phone, or it may be that the card is not installed in the right position when the card is installed, it will show that there is no SIM card, take out the card slot, and then reinstall the card can generally be solved.

2. Oxidation of the chip or metal contacts of the card.

When the card has been used for a long time, its contacts may be attacked by oxidation, so that the mobile phone can not recognize the SIM card, the solution is to bring your ID card to the business hall to change the card, and insert the new card into the mobile phone There will be a signal.

3. The SIM card is cancelled or reported as lost.

If the SIM card used is cancelled by the operator, or is reported as lost, then it can no longer be used, and the mobile phone will prompt no SIM card. Usually this situation is the operation that the phone will perform when it is dropped, and it is unlikely to encounter this phenomenon when using it yourself.

4. The phone is broken.

There is also a reason that everyone is not willing to see is that the mobile phone is broken, because sometimes the mobile phone falls or enters the water, its internal parts will be damaged, such as the baseband is broken, the motherboard is burned, etc., so that the mobile phone card is not displayed, if the new card is loaded or prompts no SIM card, then you have to check the mobile phone.

5. Whether the surface of the SIM card is dirty.

The metal surface is easy to be oxidized, causing a probabilistic posture and not knowing the card, and the surface of the chip can be wiped with alcohol.

Summary. Mobile phone communication is through the network base station to send and receive signals, and then communicate with the called party, such as the mobile phone display no service may be related to the following situations: 1, the mobile phone SIM card and the mobile phone card slot shrapnel contact is poor, resulting in the SIM card circuit can not work, the mobile phone and the network base station can not communicate, at this time you can remove the SIM card, wipe the SIM card gold finger with a cleaning cotton cloth, and reinstall.

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.

Mobile phone communication is through the network base station to send and receive signals, and then communicate with the called party, such as the mobile phone display no service may be related to the following situations: 1, the mobile phone SIM card and the mobile phone card slot shrapnel contact is poor, resulting in the SIM card circuit can not work, the mobile phone and the network base station can not communicate, at this time you can remove the SIM card, wipe the SIM card gold finger with a cleaning cotton cloth, and install the heavy car Hu Xin. 2. The mobile phone is incompatible with the system due to the installation of the application soft sail spring parts, resulting in the system software closing the modem in the mobile phone signal processing circuit, at this time the mobile phone can be turned off and then restarted, 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 the network signal coverage area has no signal, it fails to reconnect to the search network and merge the book, at this time, you can manually search for network registration under the menu of Settings - Conventional Car - Network - Network Operator. 5. The reason why 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 position, 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.

How to remove a SIM card?

Hello, you can take out the card and put it back in.