Why can t Samsung phones enable 4G

How to achieve network switching between 2G 3G and 4G mobile phones on 4G phones:

Settings - Connections - More Networks - Mobile Networks - Network Mode - 4G 3G 2G Network Mode or 3G 2G Network Mode (Select the former: If the local 4G network is covered, the mobile phone will automatically switch to the 4G network first; Choose the latter: If the local network is covered by a 3G network, the phone will automatically switch to the 3G network first).

1. Check whether the SIM card is enabled for GPRS Internet service or temporarily closed. To use the mobile phone data Internet function, the ** card needs to activate the data data Internet service. You can contact the local network provider of **card to open the data traffic Internet service.

2. Check whether the empty switch of the "Mobile Data" spine is turned on. Slide your finger down on the top curtain of the screen to turn the moving data point to the green color of the star.

3. Please try to replace it with another ** card.

4. You can also try again in a different time period or network environment.

5. Back up your phone data and restore your phone to factory settings. If the fault persists, it is recommended to send the mobile phone to the nearest service for testing and repair.

If you want to use the China Unicom 4G network, you need to meet the following conditions:

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.

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

If you are unable to use the 4G network, we recommend that you do the following:

1.Check whether the SIM card is inserted into the corresponding 4G card slot.

2.Check whether the SIM card supports 4G services.

3.Whether to select 4G network mode: Settings - Connection - Mobile Network - Network Mode: SIM1, SIM2, 4G, 3G, 2G (Auto Connect) or 3G 2G (Auto Connect).

Note: When two cards are inserted into China Unicom mobile card: 3G or 4G network cannot be used at the same time, if one card is set to 4G 3G 2G (auto-connection) or 3G 2G (auto-connection), then the other card will automatically become 2G network only.

4.Check if your area is covered by 4G networks and try to move to another location.

5.Shut down, restart, or try to change the card.

6.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 phone can't access the Internet with mobile data, Samsung phones are generally recommended to do the following:

1.Swipe down the top curtain of the screen to turn on the mobile data receipt. 【

If you can't access the Internet on your phone, it is recommended that you troubleshoot in the following ways

1] Confirm whether there is a DAO network, and it is recommended that you use the answer in a place with a strong signal;

2] 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;

3] Confirm whether the mobile phone parameters have been set;

4] 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;

5] Check whether there is a problem with the mobile phone, it is recommended that you can change the phone for testing;

6] If the total traffic generated by the Internet in the current month reaches the maximum traffic cap, the system will automatically turn off the Internet function, and the Internet will be automatically resumed in the next month;

7] The number has not been registered with the real name, and the real-name registration has not been completed within the time limit, and the service will be suspended.

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

Samsung mobile phone shows signal 4G but can't connect to the Internet, it may be because there is no cost or network problems, etc.

If your phone is not able to access the Internet with mobile data, it is recommended that you:

1. Slide down the top curtain of the screen to turn on mobile data.

3. Change other SIM cards or try to change the time period to eliminate network problems.

4. Upgrade your phone to the latest version.

5. If it doesn't work, please back up the data in your phone and restore the machine to factory settings.

If the problem persists, please bring the purchase receipt, repair card and machine to the Samsung service center for inspection.

How to maintain your phone:

1. You can use the original leather case of Samsung mobile phone: the leather case is equivalent to adding an extra coat to the mobile phone, one is to reduce the wear and tear of the mobile phone shell, and the other is to reduce the injury of the mobile phone when falling or encountering water.

2. Pay attention to the use environment of the mobile phone: there are thin seams or small holes on the mobile phone, which can easily be infiltrated when encountering water vapor and cause the circuit board to be eroded, so do not use the mobile phone in the rain or in the bathroom, and do not put the mobile phone in the air outlet of the air conditioner.

3. Develop good mobile phone carrying habits: pay attention to the carrying method, do not habitually put the mobile phone in the pocket next to the pants (back), if you accidentally press it when sitting, or if the mobile phone is squeezed and falls to the ground when walking, it will cause damage to the mobile phone.

4. Keep the mobile phone away from the magnet environment: The mobile phone speaker itself is magnetic, so do not let the mobile phone often touch the place with more iron powder, so as to avoid the mobile phone speaker sound hole inhaling too much iron powder and attaching it to the speaker film, causing the sound of the mobile phone earpiece to become smaller.

In general, it is good to restart the phone.

Samsung 4G mobile phone if you need to use 4G network, recommended.

2.The mobile phone card needs to support the 4G network, and when the mobile phone is within the 4G network coverage, the mobile phone will automatically connect to the 4G network.

You can try the 4G network setup method of Samsung mobile phone as follows: 1. Make sure that the 4G** card has been replaced and the 4G function has been activated; 2. Try to restart the phone; 3. Drag down from the top of the screen (or from the bottom to the top) to make sure "Move Data" is on; 4. Set the network mode to 4G priority or turn the 4G switch on (the setting method is to select the network according to the following path: and above versions:

Click [Settings] - [Mobile Network] - [Network Mode] and select [4G 3G 2G] to adjust. The following versions: Under the standby page, tap [Applications] - [Settings] - [Mobile Network] - [Network Mode], select [4G 3G 2G (Auto Connection)], and click [OK] after reading the network switching prompt.

If there is no network mode setting or you still cannot use 4G after setting, it is recommended to change the phone and card for testing.