I can t use the 4G network, why can t the 4G network be used?

If your phone cannot access the Internet normally, please check the following conditions:

1. If you don't restart your phone after upgrading to 4G**, you won't be able to use the Internet function normally;

2. Confirm whether there is a network, it is recommended that you can use it in a place with a strong signal;

3. Check whether there is still a phone bill in the account, if the balance is insufficient, you need to recharge before you can use it;

4. After 3-5 minutes of power off, restart the phone and try again;

5. Check whether the USIM card is inserted, if it has been inserted but still cannot be used, it is recommended that you go to the business hall to check whether the USIM card is faulty, or replace the card for testing;

6. If the traffic usage reaches the maximum value in the current month, the network will be automatically closed, it is recommended that you pay attention to our SMS reminder or inquire about the **product description.

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.

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.

Maybe your phone is not suitable for 4G Kaba.

One is the network settings of the mobile phone.

The second is that you must have a 4G network signal in that place, and now the 4G network signal coverage is not so high.

That doesn't have 4G network coverage yet?

If you are unable to use the 4G network of BlinddaUnicom, it is recommended that you use the following conditions to troubleshoot the 4G network:

Use China Unicom 4G** or have opened 4G network function;

The mobile terminal supports China Unicom 4G network;

The location has a 4G network covering China Unicom;

The number card is a USIM card, and the ** speed limit is used, and the traffic used in the current month reaches the speed limit threshold, and the speed limit occurs.

You can check whether the above conditions of the brother code are met, and you can only use the Unicom 4G network after meeting them, if you still can't use the 4G network after the dust is removed, it is recommended to consult the local Unicom customer service to check whether the base station facilities are faulty.

If you are using a vivo mobile phone, the troubleshooting method for not being able to use the 4G network is as follows:

1. Enter Settings - Mobile Network (Dual SIM and Mobile Network) - Mobile Unicom Telecom - Network Mode, 4G Mobile Phone Selection: 4G (Priority) 3G 2G, 5G Mobile Phone Selection: 5G (Priority) 4G 3G 2G

Note: If you can't see the network mode through the above methods, you can enter * * to view the network mode through the dial pad.

2. Confirm whether to use third-party magnetic or metal matching components.

Please 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.

You can observe the mobile phone signal that uses the same operator's network to dismantle the network and judge that if there is no 4G network in the same situation, it is caused by the imperfect coverage of the operator's 4G network. In a closed indoor environment (e.g., basement, elevator, etc.) or in a relatively remote area, the operator's network may not be fully covered.

4. Restart your phone or switch on airplane mode.

In some areas, the network configuration may cause the phone to fail to return to the 4G network in a short period of time, so you can restart the phone or turn on the airplane mode to try.

5. 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 to another device, or install another SIM card to your mobile phone for comparison and testing to determine whether it is a SIM card failure.

If it is a SIM card reason, it is recommended that you go to the operator's office to replace the card.

6. Upgrade the system or reset the network settings.

Please upgrade your phone to the latest version, if your phone is already the latest version, it is recommended that you go to Settings - System Management - Backup & Reset - Reset Network Settings - Mobile Unicom Telecom - Reset Settings, and then use it to 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 the Kuanyu Sakura 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 to receive you and then go over, so as to avoid delaying your precious time and letting you run in vain.

According to the information you provide, if your mobile phone cannot use the China Unicom 4G network, it cannot be ruled out that it is because you do not meet the conditions for using the China Unicom 4G network.

There are three conditions required to use China Unicom's 4G network:

Use a SIM card with China Unicom 4G function enabled (a USIM card is required to use a 4G network);

Handheld support China Unicom 4G network terminal;

Under the coverage of China Unicom's 4G network.

We recommend that you use the above conditions to troubleshoot.

Excluding the above situation, it is still not resolved, it is recommended to contact the Unicom customer service of the place where the number belongs to understand.

According to the information provided, the following three conditions are required to use the Unicom 4G network:

1. Use China Unicom 4G** or ** has opened 4G network function;

2. The mobile phone supports China Unicom 4G network;

3. The location has coverage of Unicom 4G network.

If the mobile phone is 4G** but cannot use the 4G network, it is not excluded that the mobile phone does not support the Unicom 4G network or the local network does not cover the Unicom 4G network, when the Unicom 4G network cannot be used, it will use the Unicom 2G and 3G network by default, and you can contact the local Unicom customer service for details.

If your phone can't use the 4G network, it is recommended that you try it:

1.Check whether the SIM card supports 4G services and whether the area where you are located is covered by 4G networks.

2.Verify if the phone is selected for 4G network mode: Settings - Connection - Mobile Network - Network Mode - 4G 3G 2G (Auto Connect). Note: When using dual SIM, when using 4G on one card, the other card only supports the 2G network of China Mobile or China Unicom.

3.Shut down, restart, or change card attempts.

4.If it doesn't work, it is recommended to back up the data in your phone (contacts, messages, **, etc.) and try to restore factory settings;

If the problem persists, please bring the purchase invoice, repair card and machine to the Samsung service center for professional after-sales engineers to help test.

The signal is not good, the bill is in arrears, and the phone does not support 4G

If you cannot use the 4G network of China Unicom, we recommend that you use the following conditions to troubleshoot the 4G network:

Use China Unicom 4G** or have opened 4G network function;

The mobile terminal supports China Unicom 4G network;

The location has a 4G network covering China Unicom;

The number card search early beam is a USIM card.

Therefore, you can check whether you meet the above conditions, and you can use the China Unicom 4G network only after you meet them.

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The mobile phone cannot use the Unicom 4G network, which cannot be ruled out as the following situations:

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

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

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

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 coverage of the accompaniment signal.