There is no signal for the mobile card in the elevator, and there is still a 4G signal for the telec

Samsung phones are generally recommended to do the following:

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 another SIM card.

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

If the signal is abnormal, you can follow these steps:

1. Check whether this situation occurs in other mobile users around, if there is a similar situation, it should be a local network signal problem.

2. Check the Internet settings of the mobile phone, and you can reset the network parameters and restart the operation of the mobile phone.

If you still have problems, you can call 10086 to report the situation, and we will be happy to help you.

What is the reason why the phone does not have a 4G signal?

1. Confirm that you are using a 4G mobile phone, a USIM card that supports 4G services, and that you have activated 4G**.

2. Make sure the 4G mode of your phone is turned on. On your Android phone, open Settings - > Mobile Network - > Network Mode, and select 4G mode; On your iPhone, open Settings - > Cellular and tick "Enable 4G".

3. If the mobile phone still has no 4G signal if you meet the above two points, please turn on the airplane mode and turn it off, and wait for the mobile phone to search for the signal, usually 10 seconds. (For Android phones, please press and hold the power button of the phone, select the airplane mode when options such as shutdown and restart airplane mode appear, and click on Settings for Apple 5s - > airplane mode, or swipe up directly from the bottom of the home screen).

5. Press and hold the power button of the mobile phone, restart the mobile phone, and then verify with the operator of the mobile phone card to confirm the tariff and related status of the mobile phone card. Or in the interface of the mobile phone, pull down the notification bar of the mobile phone to turn on the mobile data;

Hello! The biggest possibility is that you are in an underground garage, an elevator or a remote mountainous area with poor signal coverage, or the SIM card is loose and can be re-plugged. It could also be that there is a problem with the cellular network settings and you need to set it up again. iPhone.

One: Open the phone settings, turn on the airplane mode button, wait for a while, and then turn off the airplane mode to see if it returns to the normal state.

Method 1 <> Huawei phone: Open the phone settings, touch Mobile Network, turn on airplane mode, wait for a while, and then turn off airplane mode to see if it returns to normal state.

<> ask questions. Hello! Hold on.

Hello! The mobile phone shows no service, it is recommended to check it by pressing the following methods: 1. Whether the SIM card is inserted correctly.

2. Whether the wrong SIM card is inserted, such as the standard version inserted into the Unicom SIM card, etc. 3. Enter the hardware detection to check whether the SIM card is working properly (enter * * in the dial interface). If the SIM status is normal, go to step 5, if the status is unknown, go to the step to try to replace a different SIM card, if the status is still unknown during hardware detection, it is recommended to go to the maintenance point for testing; If the detection status is normal, it is recommended to go to the carrier to replace a SIM card (the SIM card may be aging).

5. Whether the network type is correct and whether the operator selects whether it is automatic. (China Unicom selects 3G first, mobile selects only 2G, and telecom selects automatic) 6. If the network type of the non-telecom version of the mobile phone is CDMA automatic, you need to change the network type to "wcdmapreferred" in the mobile phone information (**) to solve the problem. 7. Whether there is no signal in the area.

You need to check whether other mobile phones on the same network have signals. 8. Back up the data, flash to the latest system version and try again. 9. If the above methods still can't help solve the problem, please go to a nearby maintenance point for maintenance and testing.

If your area is far away from the cell tower, or there is no cell tower, this will happen, you can restart the phone to try it, and there is also a possibility that the phone is down.

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. 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.

Can you elaborate on that a little bit more?

Mobile phone communication is through the network base station to send and receive signals, and then communicate with the called silver caller, such as the mobile phone display no service may be related to the following situations: 1, the mobile phone SIM card is in poor contact with the mobile phone card slot shrapnel, 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.

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. The signal coverage of the mobile phone SIM card network operator is not covered by the front number cover, at this time, you can change the location to the 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.

Summary. Dear, I will find out for you: mobile small card, that is, China Mobile's SIM card.

The SIM card you get when you first enter the network is embedded in a large card, and most mobile phones use standard cards, and you can use the small card by taking it off the big card and stuffing it into the SIM card slot of the mobile phone. The size of the SIM card is 54mm 85mm (the standard size of the bank card), the size of the standard card is 25mm 15mm (smaller than an ordinary stamp, about the size of a finger), and the small SIM card (microSIM card) is 12x15mm.

Dear, hello, I found out for you: the other party moves** There is no signal, and the other party will be temporarily unreachable, and the other party has set up call forwarding. If the owner of the phone you dialed has set up call forwarding to a blank number, then you dial the other party's ** because the system cannot find valid information, this kind of prompt will appear.

Can you tell us more about that?

Dear, I will find out for you: mobile small card, that is, China Mobile's SIM card. The SIM card you get when you first enter the network is embedded in a large card, and most mobile phones use standard cards, and you can use the small card by taking it off the big card and stuffing it into the SIM card slot of the mobile phone.

The size of the SIM card is 54mm 85mm (the standard size of the bank card), the size of the standard card is 25mm 15mm (smaller than an ordinary stamp, about the size of a finger), and the small SIM card (microSIM card) is 12x15mm.

Hello and welcome to the Samsung Digital Services platform.

Is it a 3G card? If yes! Select the menu tool Settings Mobile Network Change the network mode to 3G