Why is there no service for mobile phone cards, and what is the situation when there is no service f

The location is in a remote mountainous area, and it is normal for the mobile phone to show no service, so you can check it again in a different location.

The signal is unstable and will be restored when the user is out of state.

If the SIM card of the mobile phone is in poor contact with the shrapnel of the mobile phone card slot, wipe it with a cleaning cotton cloth and reinstall it.

The mobile phone SIM card is not registered in the network, and you need to go to the business hall to re-register.

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 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-dot button or four-dot button in the upper right corner;

e.Click Reset to default.

Method 2: If your phone is EMUI and above or Magic UI and above, or HarmonyOS 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-dot button or four-dot 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.

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 there is no service for the Unicom mobile phone card, there may be the following reasons:

1.The mobile phone card is not plugged in properly, and the contact is poor;

3.The mobile phone card, card slot or mobile phone terminal is damaged;

4.The status of the mobile phone card is abnormal (such as shutdown, closed account, etc.);

5.The mobile terminal does not support China Unicom.

Here are some things you can try:

1.Turn the phone on and off and restart it to test it;

2.Reseat the mobile phone card and check whether the card slot is loose or deformed.

4.Test whether the mobile phone card or terminal is faulty;

5.Verify that the status of the SIM card is normal;

6.Check whether the mobile terminal supports China Unicom.

If the above methods still cannot solve this problem, it is recommended to contact the local Unicom customer service or consult the official customer service of the mobile phone for understanding.

Hello, no service of mobile phone card means that your mobile phone card cannot be connected to the mobile communication network, and cannot make calls, text messages, and Internet access. This condition can be caused by the following reasons:1

Signal problems: If you are in an area with a weak or no signal, your SIM card will not be able to connect to the mobile network, resulting in a no-service pick-up situation. 2.

SIM card failure: If your SIM card is damaged or expired, it will also lead to the situation that the mobile phone card is not served. 3.

Phone setup issues: If your phone is set up incorrectly, such as disabling mobile data or turning off airplane mode, it will also cause the SIM card to be out of service. 4.

Carrier issues: If the carrier to which your SIM card belongs fails or is maintained, it will also cause the SIM card to be out of service. In order to solve the problem of no service with mobile phone card, you can try the following methods:

1.Check the signal: Move to a place where the signal is better, or try restarting your phone.

2.Replace your SIM card: If your SIM card is expired or damaged, you will need to replace it with a new one.

3.Check your phone's settings: Make sure your phone is set up correctly, such as turning on mobile data and turning off airplane mode.

4.Contact your carrier: If none of the above methods can solve the problem, you are advised to contact the customer service of your carrier for help.

In short, the situation of mobile phone card without service may be caused by a variety of reasons, which need to be troubled and resolved according to the specific situation.

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.

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.

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 your phone (if you have a removable battery, it's best to remove the battery and restart it).

Put the card on another mobile phone and 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.

There is no service for the mobile phone card:

1 Mobile phone card problem, a to detect whether the mobile phone card installation is loose, b whether it is caused by arrears, c whether the sim is damaged, the elimination method is very simple, change to another sim card to see.

2 Mobile phone problems, a detect whether the mobile phone card slot is damaged, replace the card.

b Check whether the airplane mode is turned on on the phone, and if so, turn it off.

c SIM card is not compatible with the mobile phone, generally this is that your card can be used in other mobile phones, and other normal cards can be used in your mobile phone, this situation can only be solved by changing the card.

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.

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

Try it at the copper plate or change your phone.