Only 3G is displayed when booted, why does it keep displaying 3G?

1. Go to Settings - Mobile Network.

Dual SIM & Mobile Network) -- Tap on the corresponding SIM card.

Network mode, 4G phone selection: 4G (priority) 3G 2G, 5G phone.

Choice: 5G (Priority) 4G 3G 2G;

2. Network configuration in some areas may cause the mobile phone to fail to return to the 4G network in a short time.

You can restart your phone or turn this off airplane mode.

Try; <>

3. 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 and Reset - Reset Network Settings - Select the corresponding SIM card - Reset settings, and then use it to view.

4. Back up your data, go to Settings - System Management - Backup & Reset - Restore all settings, and follow the on-screen prompts.

Note: Restoring all settings will not delete any data or files, only all settings of the phone will be restored, some third-party application accounts need to be logged in again, please confirm that it does not affect the use of the software before operating.

If the above methods fail to help recover, the customer service center needs to be tested and processed (customer service center address: banquet chain enters vivo official website vivo**app--my--service outlets, after-sales outlets--select provinces and cities to query the address of the customer service center).

You can turn on airplane mode and turn it off, or restart your phone to try, or if it doesn't work, it is recommended to call the operator directly**.

You can call your local 10010 customer service to check if the Unicom network around you is normal. [Tips for mobile phones that can't use 4G]:

2. Please confirm whether the mobile phone is a USIM card, and you can check whether the reverse side of the mobile phone card is Wukai and whether there is a "USIM" logo.

3. Please confirm whether the mobile phone has a 4G signal display, or you can find out whether other Unicom users around you have a 4G network.

4. Please confirm whether the mobile phone has opened the 4G function, and you can check the pants through the hand hall - service - handling - opening the 4G network.

5. If it still can't be solved, please seek manual help.

Dear Lenovo users, hello!

Dear Lenovo users, hello!

Your phone stays parked on this screen, you can follow the process below.

1) Reboot first to see if you can enter the system.

2) Enter recovery double clear, but this will clear the data in the phone back to the factory state, do not back up in advance and use this method with caution!

How to enter Recovery Double Clear.

3) If you still can't enter the system after double clearing, it may be caused by kernel damage and incompatibility or hardware damage, it is recommended that you go to your local Lenovo mobile phone service outlets and hand over your mobile phone to an engineer for maintenance.

Lenovo mobile phone service outlets query.

1.Go to the official website or forum of the mobile phone to find the card swipe package of the machine, and then put it in the memory card to complete the card swiping, because the card swiping methods of different models are different, there is no detailed tutorial here, users can go directly to the official website or forum to find.

2.Bring the purchase invoice, three-pack card and other documents to the local mobile phone brand corresponding after-sales department to complete the system brushing, and users can find the after-sales address through the official website of the mobile phone brand.

Re-flash, there is a problem with the system