The cell phone signal shows that there is no 3G data service

China Unicom users cannot use the 4G network:

1. Please check whether the mobile phone settings are enabled for 4G network.

3. If other Unicom users can use it normally, carry out a test of changing the phone and changing the card to see if this card is placed on other mobile phones, if the situation is the same as before, you can take the card to the nearest business hall and ask the staff to assist in the test; If this is not the case, it is recommended that you take your mobile phone to the after-sales service.

If you are using a Huawei mobile phone, there are many reasons why the mobile phone does not have a 4G signal but only a 3G 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, the main card will display 3G:

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 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.

5.Please restart your phone or switch on and off airplane mode.

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.

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 3G signal, please 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 for testing.

Make an appointment for service. Boarding service.

Repair spare parts** inquiry.

If it is displayed as 3G, it may be because there is no 4G network or weak 4G coverage in the current area, and you can move to other regions to try.

The conditions for using China Unicom's 4G network are:

1. The mobile terminal must be a terminal that supports China Unicom's 4G network standard; The mobile phone tariff must be China Unicom 4G** tariff, or China Unicom 4G network has been opened;

2. China Unicom 4G network can only be used under the coverage of China Unicom's 4G network signal, and if there is no 4G network coverage, it can be backward compatible with China Unicom's 3G and 2G networks;

4. Turn on 4G in the network settings of the mobile terminal;

5. Check whether the traffic of the month is capped or the network speed is limited.

There are many possibilities to show the reason for 3G, and it is likely that there is no 4G signal in the current area, or that this 4G signal is relatively weak. The second possibility. It is the hand and the state of the multi-card, for example, some smart phones in the early days of some cards, it is not possible to double 4G with a machine, especially when it comes to the main card of Telecom for Telecom for 4G, the secondary card can not be 4G, Unicom Mobile can only be 3G or 2G, at that time Telecom double 4G can not be used, a card is a typical other telecom card in the world can not register the network.

There is another possibility, the probability of this possibility is relatively small, that is, your mobile phone does not support the operator's 4G.

Dear, Hello set the mobile phone network type to only use the 3G model, at this time the mobile phone will automatically block the 4G network, causing the signal display to become a 3G network. Due to the poor signal of the current 4G network and the lack of full coverage, the mobile phone will automatically downgrade to receive the 3G network.

The conditions for using China Unicom's 4G network for extended data are: 1. The mobile phone terminal must be a terminal that supports China Unicom's 4G network standard; The mobile phone tariff must be China Unicom 4G** tariff, or China Unicom 4G network has been opened; 2. China Unicom 4G network can only be used under the coverage of China Unicom's 4G network signal, and if there is no 4G network coverage, it can be backward compatible with China Unicom's 3G and 2G networks; 3. The network signal will be affected by various factors such as topography, landform, high-rise buildings, and climate; You can try moving to another place to search for a 4G signal; 4. Turn on 4G in the network settings of the mobile terminal; 5. Check whether the traffic of the month is capped or the network speed is limited.

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Questions. How to check if there is a cap.

The mobile phone cannot use the Lianying Tantong 4G network.

It is not excluded that the following cases are:

1. The 4G Internet access function has not been opened;

2. The mobile phone does not support the 4G network of China Unicom, or the mobile phone you use only supports the 4G network of other operators, and does not support the 4G network of China Unicom;

3. The location has not yet covered the Unicom 4G network.

4. The city where it is located has Unicom 4G network coverage, but the mobile phone is in a relatively remote area or a blind spot with poor signal coverage.

Landlord, hello, are you using a Unicom 3G card or a mobile 3G card? If you are using a Unicom 3G card, enjoy a 2G network, and if you are using a mobile 3G card, use a 3G network. The following three conditions must be met:

1;Use a 3G card supported by your mobile phone (X909T supports mobile 3G)2: Local 3G network coverage3: Turn on the 3G functionHave you turned on the 3G function?

Is there 3G network coverage? You observe and try.

There are several possible causes.

1. The mobile phone card is not a 3G card: if it is a 2G card, it is not possible to use the 3G network.

2. The current signal is not good: you need to receive a 3G signal to use the 3G network, and you cannot use the 3G network without a 3G signal.

3. If the 3G function is not turned on: open the phone's settings - find the cellular data network and turn it on - and then turn on the 3G switch button under the cellular mobile data to use the 3G network.

4. Mobile phone arrears: The mobile phone in arrears cannot connect to the network and will not display a 3G signal.