What should I do if my SIM card keeps showing no service?

If your mobile phone cannot access the Internet normally, please check the following conditions:

1. After 3-5 minutes of power off, restart the phone and try again;

2. Confirm whether there is a network, it is recommended that you can use it in a place with a strong signal;

3. Check whether there is still a phone bill, if the balance is insufficient, you need to recharge before you can use it;

4. Check whether the USIM card is inserted, if it has been inserted but still cannot be used, it is recommended that you go to the business hall to check whether the USIM card is faulty, or replace the card for testing;

5. If the traffic usage reaches the maximum value in the current month, the network will be automatically closed, it is recommended that you pay attention to our SMS reminder or inquire about the **product description.

1. Check the operator**.

Please check the status of your SIM card** and make sure that the SIM card is not in arrears or cancelled.

2. Confirm whether to use third-party magnetic or metal accessories.

Check whether you use metal protective shells, magnetic protective shells, magnetic brackets and other accessories, metal and magnetic materials are easy to interfere with signal reception, it is recommended that you remove the accessories to view.

3. Check whether the current environment covers the operator's network.

If you are in a closed indoor environment (such as a basement, elevator, etc.), the mobile phone signal may be blocked, resulting in no signal, and you can go to an outdoor environment to check. If you are in a remote area and the carrier network may not be covered, you can determine whether the network coverage is due to the mobile phone signal that uses the same carrier network in the surrounding area.

4. Check the SIM card and perform cross-card verification.

Observe whether there is dirt or oxidation on the metal surface of the SIM card, and check it after cleaning. If you use a tailor-made SIM card, it is recommended to replace it with a standard SIM card. Install the SIM card into other mobile phones that support this card for comparison test, if there is no signal, it is recommended that you consult the operator for processing.

5. Confirm whether the mobile phone supports the corresponding operator's mobile phone card;

6. Reset network settings.

Go to Settings - System Management - Backup & Reset - Reset Network Settings - Select the corresponding SIM card - Reset Settings, and then use View.

Note: Resetting network settings resets Wi-Fi, mobile data, and Bluetooth connection records.

7. Service center testing.

If the above methods fail to solve your problem, please back up your mobile phone data in advance, bring your mobile phone and purchase voucher to vivo customer service center for testing, pay attention to WeChat *** "vivo" or "vivo customer service" to inquire about the service center address**, it is recommended to contact before going to ensure that there is a staff reception before going over, so as to avoid delaying precious time and running in vain.

If you are using a Huawei phone.

When your phone shows no service, it is recommended to take the following methods to try to solve it:

1.Avoid using magnetic metal cases, magnetic stands, or magnetic chucks.

Metal and magnetic materials are easy to interfere with the signal, resulting in no service for the mobile phone.

2.Please try to change to another SIM card.

It is recommended that you install other mobile phone cards into your mobile phone to view, if the signal display of other mobile phone cards is normal, it may be that there is a problem with your mobile phone card, it is recommended that you go to the operator's business office to replace a new mobile phone card.

3.Please try moving to your current location.

1) In some more closed indoor environments, such as houses with dense spacing between buildings, the mobile phone signal may be blocked, resulting in no service. You can get outside to see if your phone signal is back to normal.

2) The degree of network coverage of operators varies according to different regions, and urban areas basically meet the coverage, but some remote areas may have insufficient coverage capacity, which will lead to no service for mobile phones.

You can determine whether the current regional network coverage is caused by poor network coverage by whether the mobile phone is not available in the same area, or whether the mobile phone using the same carrier** card in the vicinity is also not available.

4.Check that the APN settings are correct.

Incorrect APN settings will affect the normal use of the network.

Method 1: aClick Settings;

c.Click on the APN name (APN) to go to the APN page.

d.Turn on the three dots button in the upper right corner;

e.Click Reset to default.

Method 2: If your phone is an EMUI and above or Magic UI and above, you can also follow the steps below:

a.Click Settings;

b.Click Mobile networks.

Then tap Mobile Data;

c.Click on the APN name (APN) on the Mobile Data page to go to the APN page.

d.Turn on the three dots button in the upper right corner;

e.Click Reset to default.

Settings > Wireless & Networks > Mobile Networks > Access Point Name (APN) > turn on the three dot buttons in the upper right corner > reset to default.

5.Please reset your network settings.

If the above troubleshooting does not resolve your issue, we recommend that you contact Huawei Consumer Service** (950800) for further assistance, or back up your data in advance (WeChat QQ and other apps need to be backed up separately), and bring your purchase voucher to a Huawei customer service center near you.

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.

If there is no signal on the phone or a no service or 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.

Note: Please back up the data (contacts, messages, **, etc.) in your device before upgrading. The mobile phone card suddenly has no service, it may be a signal blind spot, the card is in poor contact, the mobile phone model does not support the current mobile phone card, and the baseband is a problem.

1. Signal blind zone.

For example, in the elevator or some very remote corners, there will be no service, but sometimes after returning to the normal signal area, the mobile phone cannot automatically search for the signal, so you need to manually restart or turn on the airplane mode and then turn it off to search for the received signal again.

2. Poor card contact.

If you often unplug and unplug the **card, the metal chip on the **card may be in poor contact with the mobile phone, resulting in the mobile phone occasionally has no signal, unplug the ** card to clean the lower surface and try again.

Use a needle to get the mobile phone card out and then press it in, if it doesn't work, there is a problem with the place where the card core is pressed.

This must be multifaceted, either you don't put the card on well, or the phone is broken, or there may be no network, which will cause the display to have no service.

Change the phone card one, or restart the phone several times.

How to recover the mobile phone card without service?

Summary. Hello, glad to answer for you. The reasons and solutions for the SIM card to suddenly show that it is out of service are as follows.

Hello, it's an honor for me to answer your questions, it will take a little time to sort out the answers, please be patient

Hello, glad to answer for you. The reasons and solutions for the SIM card to suddenly show that it is out of service are as follows.

1.Whether the SIM card is inserted in the correct way, or whether the mobile phone is not fully Netcom and an unsupported carrier card is inserted;

2.Try to enter [* *] in the dialing interface of the mobile phone to check whether the status of the SIM card is normal, you can use other SIM cards to test whether the mobile phone or SIM card is faulty;

3.In the phone settings, see if the network type is set correctly and whether the carrier selection is automatic;

4.In addition to the suspicion due to hardware or Chunshou SIM card, it may also be due to the lack of signal in the area, it is recommended to turn on the [airplane mode] of the mobile phone, and then turn it off after a while to see if the letter Wangzi number is searched;