What s going on without a 4G signal, what s going on with a 4G network without a signal

The phone does not show 4G, you can try the following:

<> mobile phone needs to use the operator's SIM card corresponding to the supported 4G network, if the mobile phone is a mobile version, it is recommended to use a mobile SIM card;

Call your carrier's customer service to see if your SIM card has a 4G network**.

Make sure that the local coverage is the 4G network of the operator to which the SIM card belongs, and if necessary, it is recommended to change the network environment to observe.

Check whether the mobile phone has enabled the 4G network mode, and go to the mobile phone settings - mobile network dual SIM and mobile network - network mode to view.

Some models require you to enter * * in the dial pad.

<> turn off the data network, wait a few minutes, and then turn it back on for observation.

Go to Phone Settings - Mobile Network Dual SIM & Mobile Network - Access Point (APN), select "Reset to Default Settings", and then turn off and restart to try:

<> reset the mobile phone network, first set the network to 2G, wait for the network to stabilize, then set it to 4G, and then restart the phone.

If you are unable to use our 4G network, it may be due to the fact that you do not meet the conditions for use. At present, when using the China Unicom 4G network, the following conditions must be met before it can be used

The mobile terminal supports China Unicom 4G network;

The current location has a 4G network covering China Unicom;

Use Unicom USIM card;

The number has 4G Internet access enabled.

If you meet the above conditions and cannot use our 4G network, you can contact the local customer service to help check whether there is a fault in the 4G base station near your location and deal with it according to the guidelines.

1. The mobile terminal must support 4G network; The mobile phone tariff must be China Unicom 4G** tariff, or the 4G network must be opened; 2. The 4G network can only be used under the coverage of the 4G network signal 3. The network signal will be affected by various factors such as terrain, landform, high-rise buildings, and climate.

There may be the following reasons for not having a 4G network in the case of a normal phone state:

1、.Whether the identity friend can have a 4G network, if others can use it, it means that there is no problem with the current network. If you can't use it, you can contact your local customer service to report the problem

2. Whether the mobile phone card and mobile phone support 4G. You can dial out the mobile phone card and put it in other mobile phones that support 4G for testing, if it can be used, it means that the original mobile phone cannot use 4G signal; If you can't use 4G in other mobile phones, it means that the mobile phone card is not a 4G card, and you need to go to the local business hall to change the card

Answer 1: There is no signal or the signal is poor, because the signal will be affected by various factors such as terrain, landform, high-rise buildings and so on in the process of propagation, if you are in a relatively closed place, the signal will be affected. Here's how to do it: turn your phone on and off again and try again; Swap the SIM card to a family member's or friend's phone and try again; Check whether the mobile phone signal of other Unicom users around you is normal.

2. If it still cannot be used normally after self-service troubleshooting, it is recommended that you contact the local manual customer service for verification and processing.

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Hello, 1The phone's 4G mode is not turned on Check whether the phone's 4G mode is turned on. On your Android phone, open Settings - > Mobile Network - > Network Mode, and select 4G mode; For iPhone, also open Settings - > cellular network, check "Enable 4G".

2.The network in your place is not very good in the corner of the floor, or in a more remote place, there may be dead spots in the coverage of the 4G network, you can compare it with other mobile phones using the same mobile phone card operator, or consult the mobile phone card operator to understand the local 4G network coverage.

3.If this happens, you only need to turn on the airplane mode of the mobile phone, and then turn off the airplane mode, so that the mobile phone can search the network again, and this problem can be solved. I hope it helps.

If you are using a Huawei mobile phone, there are many reasons why the mobile phone does not have a 4G signal and only a 2G signal, please follow the following methods to troubleshoot:

1.If you have no 4G signal on the primary SIM card when you are using dual SIM, make sure that the supplementary SIM card is receiving MMS.

If you encounter a problem when the supplementary card receives SMS and MMS messages, the main card will display 2G:

1) You can enter the information interface, click on three dots or four dots, enter More > Settings > Advanced or Settings > Advanced, and then set Auto MMS to Off.

2) If your mobile phone supports dual VoLTE dual pass, it is recommended that you enable the Dual SIM VoLTE function: in the VoLTE network coverage area, when the dual HD icon is displayed in the status bar of the mobile phone, two cards can work at the same time.

2.Please make sure the 4G switch is enabled.

1) When installing a single SIM: Please swipe down from the top of the phone screen, open the shortcut menu, press and hold the mobile data icon, enter the settings interface, turn on Enable 4G or select 4G 3G 2G in network mode to automatically select.

3.Please move your current location.

You can consult the network coverage of the local operator, or observe the mobile phone network conditions using the same operator's SIM card nearby, if there is no 4G network in the same situation, it is generally caused by the poor and unstable 4G network coverage of the local operator, it is recommended that you try after moving to other places.

4.Please restart your phone or turn on and off the airplane mode to prepare quietly.

The special configuration of some networks may cause your phone to be unable to return to the 4G network for a short period of time, but it can be restored after restarting the phone or turning on the airplane mode.

5.Please reset the APN

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

It is recommended that you open Settings, enter APN in the search bar at the top, click Access Point Name (APN) to jump to the mobile data settings interface, click the Access Point Name (APN) again, then click the three dots in the upper right corner, and select Reset to Default Settings.

6.Please reset your network settings.

7.Please remove the SIM card.

1) If your mobile phone card is manually cut card, it may affect the signal reading 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 mobile phone card.

2) Dirty or oxidized SIM cards will also affect the reading of signals, so it is recommended that you keep the SIM card clean.

8.It is recommended to update to the latest system version in a timely manner.

If your phone still only has a 2G signal, contact Huawei Consumer Service** (950800), back up your data in advance (third-party apps such as QQ and WeChat need to be backed up separately), and bring your purchase voucher to a nearby Huawei Customer Service Center.

Boarding service. Repair spare parts** inquiry.

Huawei Customer Service Center.