Solution:
1, first enter mobile phone settings-dual card management-default internet access-select the card that needs internet access to open it.
2. Or drop down the notification bar-data connection-and select the card that needs to access the Internet.
3. Enter Settings-More Wireless Settings-Mobile Network-Data Service-Network Mode-3G or 4G only.
4. If you still can't surf the Internet after setting the above methods, it is recommended to back up the important data in your mobile phone and try to restore the factory settings:
Settings/All Settings/Backup and Reset/Restore the factory settings/Save the contents in the phone's memory (photos will not be lost)/Check, reset the phone/clear all contents.
2. Why did the mobile phone suddenly lose its 4g network?
What is the reason why the mobile phone has no 4g signal?
1. Make sure that you use a 4G mobile phone, a USIM card that supports 4G services, and have a 4G package.
2. Confirm that the 4G mode of the mobile phone is turned on. Android phone open settings-> Mobile network->; Network mode, select 4G mode; Apple phone open settings-> Cellular mobile network, check "Enable 4G"
3. If there is still no 4G signal on the mobile phone at the above two points, please turn on the flight mode and turn it off, and wait for the mobile phone to search for a signal, usually 10 second. (For Android phones, please press and hold the phone power button, and select the flight mode when the options such as machine/restart/flight mode are concerned. For Apple 5S, please click Settings-> Flight mode, or slide up directly from the bottom of the home screen)
4. If it still doesn't recover, please turn off the phone (unplug the battery if possible), take out the USIM card and reinsert it, then turn it on and wait for the phone to search for a signal.
5. Press and hold the phone power button to restart the phone, and then check with the phone card operator to confirm the phone card tariff and related package status. In the mobile phone interface, click Settings-Card Settings to open the mobile data; Or in the mobile phone interface, press the notification bar of the handle to open the mobile data;
With the development of science and technology, electronic products have developed rapidly. Mobile phones have changed from 2G and 3G to 4g, and we use them more smoothly. Therefore, as we all know, our mobile phone suddenly lost its 4g signal during use. What is the reason? Is there something wrong with our mobile phone or something else? What should I do in the future? Let me introduce you to the specific solution!
What is the reason why the mobile phone has no 4g signal?
1. Confirm that you are using a 4G mobile phone, a USIM card supporting 4G services and a 4G subscription.
2. Confirm that the 4G mode of the mobile phone is turned on. Android phone open settings-> Mobile network->; Network mode, select 4G mode; Apple phone open settings-> Cellular mobile network, check "Enable 4G"
3. If there is still no 4G signal on the mobile phone at the above two points, please turn on the flight mode and turn it off, and wait for the mobile phone to search for a signal, usually 10 second. (For Android phones, please press and hold the phone power button, and select the flight mode when the options such as machine/restart/flight mode are concerned. For Apple 5S, please click Settings-> Flight mode, or slide up directly from the bottom of the home screen)
4. If it still doesn't recover, please turn off the phone (unplug the battery if possible), take out the USIM card and reinsert it, then turn it on and wait for the phone to search for a signal.
5. Press and hold the phone power button to restart the phone, and then check with the phone card operator to confirm the phone card tariff and related package status. In the mobile phone interface, click Settings-Card Settings to open the mobile data; Or in the mobile phone interface, press the notification bar of the handle to open the mobile data;
6. Confirm the local signal coverage:
In the corner of the floor, or in a relatively remote place, there may be dead corners covered by 4G networks. You can compare it with other mobile phones using the same mobile phone card operator, or consult the mobile phone card operator to understand the coverage of local 4G networks.
7. Mobile phone network settings:
In the mobile phone interface, click Settings-Card Settings to set the network mode to 4G/3G/2G; On the phone settings page, click Enter More to set the network operator to automatic selection;
The mobile phone can't connect to the 4G network.
If you are using a vivo phone, and the phone can't use the 4G network, you can check it according to the following methods:
1. The mobile phone should use the SIM card of the operator corresponding to the supported 4g network;
2. Inquire whether the SIM card used has opened the 4g network package;
3. Confirm whether the local area covers the 4g network of the operator to which the SIM card belongs, and change the network environment to observe and see;
4. Check whether the mobile phone has turned on the 4G network mode, and enter the mobile phone settings-mobile network/dual card and mobile network-network mode. Some models need to be entered: * # * # 2288 # * * to view;
5. Close the data network and wait for a few minutes before opening the observation;
6. Go to Settings-Mobile Network/Dual Card and Mobile Network-Access Point (APN), select "Reset to Default Settings", and then shut down and try to restart;
7. Reset the mobile phone network, first set the network to 2G, then set it to 4G after the network is stable, and then restart the mobile phone.
4. What is the reason why the mobile phone can't connect to the 4g network?
The reasons why the mobile phone cannot connect to the 4g network and the corresponding solutions are as follows:
First, the phone is in arrears.
1. When the mobile phone is in arrears, the operator will suspend the Internet access function.
2. Solution: Check whether there is phone bill in the account. If the balance is insufficient, you need to recharge it before you can use it.
Second, after the arrears were re-paid, the mobile phone was not turned on and off again.
1. GPRS that has just been paid will be automatically turned off, resulting in the phone being unable to connect to the 4G network.
2. Solution: You need to restart the phone or turn off the flight mode.
Third, the cell phone network signal is not good.
1, the mobile phone network signal is not good, which will cause the mobile phone to be unable to connect to the 4G network.
2. Solution: Use your mobile phone in an open place, or use other mobile phones to test whether there is no 4G network coverage in this area.
Fourth, mobile terminals do not support 4G networks.
1. Some elderly people don't have Internet access function, and the mobile phone terminal itself doesn't support 4G network.
2. Solution: Change to a mobile phone that supports 4G network.
5. There is something wrong with the mobile phone settings.
1, if there is something wrong with the phone settings, you will not be able to use the 4G network. For example, the network standard of mobile phone number setting connection is Unicom, so it won't work.
2. Solution: Reset the mobile network. Take the nut R 1 as an example, the specific steps are as follows:
The first step is to open the settings.
Step 2, click cellular mobile data.
Step 3: After clicking cellular mobile data, click the following advanced settings.
Step 4: Click Advanced Settings, and then click Operator Selection.
Step 5: Click Operator Selection to open the button of automatic operator selection, or set the operator corresponding to the mobile phone number yourself.
In this way, you can connect to the accurate operator network standard and surf the Internet normally.
5. The mobile phone turns on the 4G connection, indicating that it is connected, but it cannot access the Internet. What happened?
If Samsung mobile phones can't access the Internet with data traffic, we suggest the following steps:
1. Check whether the SIM card has GPRS Internet service or is temporarily closed.
To use the data access function of the mobile phone, the calling card needs to open the data traffic access service. You can contact the local network provider of the calling card to open the online service of data traffic.
2. Check whether the "Move Data" switch is turned on.
Slide your finger down the curtain at the top of the screen and turn the Move Data pointer green.
If you still can't access the Internet after the above operations, it is recommended to reset the parameters of mobile Internet access: Settings-Mobile Network-Access Point Name-More-Reset to the default settings.
Please change a calling card.
4. You can also try again in another time period or network environment.
5. Back up mobile phone data (phone book, text messages, pictures, etc. ) and restore the phone to the factory settings.
If the fault still exists, it is recommended to send the mobile phone to the nearest service center for testing and maintenance.
6. What if the mobile phone can't connect to the 4G network?
If the mobile phone cannot use the 4G network, we recommend that you:
1. Whether to use the mobile phone card with 4G service, I suggest you contact the network operator to open 4G service.
2. Check whether the 4G network mode is enabled: Settings-Connect-More Networks-Mobile Networks-Network Mode-Select the 4G/3G/2G(LTE/WCDMA/GSM) network mode (some mobile phones/tablets do not support changing the network frequency band).
3. Confirm that the location has 4G network coverage.
4. Try to shut down and restart.
5. Back up data (contacts, text messages, pictures, etc.). ) and restore the factory settings.
If the problem still exists, it is recommended that you take the purchase invoice, maintenance card and machine to the local Samsung after-sales service center, and professional engineers will help you test it.
7. How to solve the problem that the mobile phone can't connect to the network when the 4G signal is full?
1. Click to enter the setting function of the mobile phone desktop.
2. Click the Mobile Network option.
3. If the data network option is turned off, click the back button to open 100, and you can surf the Internet.
If the data network is open, we can't access the Internet. Click turn it off first, then turn it on later to see if you can surf the Internet.
5. In the setting interface, turn on the flight mode, and then turn it off to see if you can surf the Internet.
6. If there is no network just after recharging, you can restart your mobile phone to surf the Internet.
Extended data
The application of smart phone must be based on network. Once the mobile phone is not connected to the network, many functions cannot be realized. For users who hold the telecom version or some non-mainstream signal standard versions of mobile phones, whenever they brush the newly adapted ROM of a third party, they will encounter the trouble of no answer connection in the mobile network. This directly leads to the unavailability of mobile data, telephone calls and short messages.
Solution to the instability of mobile phone network
Step 1: First, determine whether the wireless signal in the current area of the mobile phone is bad, such as the corner, which is too far away from the router.
Step two. Sometimes it may be that the network settings of the mobile phone's own system are a bit confusing, resulting in poor signal when connecting to the wireless. At this time, you can try to restore the mobile phone network settings and see if you can solve the problem.