3G signal not showing? Why is my phone not showing 3G signal

Hi! Xiaomi mobile phone shows no service, it is recommended that you check it according to the following methods:

Whether the SIM card is inserted correctly.

Whether the wrong SIM card is inserted, such as the standard version inserts the telecom SIM card, etc.

Go to Hardware Detection to see if the SIM card is working properly (enter * * on the dial screen). If the SIM status is normal, go to step 5, or if the status is unknown, go to step 4.

Try to replace a different SIM card, if the status is still unknown during hardware testing, it is recommended to go to the repair 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).

Whether the network type is correct and whether the carrier selects Automatic. (China Unicom selects 3G priority, mobile selects only 2G, and China Telecom selects automatic).

If the network type of the non-telecom mobile phone is CDMA automatic, you need to change the network type to "WCDMA Preferred" in the mobile phone information (**) to solve the problem.

Whether there is no signal in the area. You need to check whether other mobile phones on the same network have signals.

Back up your data, flash to the latest system version and try again.

If the above methods still do not help you solve the problem, please go to your nearest repair point for repair inspection.

Probably you've arrived in a place where there is no 3G signal.

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.

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.

There are several possible causes:

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

2 When the network signal is poor before burnout, the 3G network can be used after receiving the 3G signal Pikai Zhi.

3 If the 3G function is not enabled, you need to open the settings of your phone, find the cellular data network and turn it on, and then turn on the 3G switch button in the cellular data to use the 3G network.

4 If the mobile phone is in arrears and cannot connect to the network, the 3G signal will not be displayed.