If the mobile phone suddenly changes from 4G to 2G during use, there may be a variety of reasons, such as network signal problems, mobile phone arrears, etc. The specific causes and solutions need to be investigated one by one. In the following, we will analyze the possible causes and then provide solutions.
1. The mobile phone signal suddenly becomes 2G, which may be due to the following reasons:
1.If the mobile phone is in arrears, the operator will cut off the signal connection and automatically turn it into a 2G or 3G that cannot access the Internet.
2.Geolocation: If the mobile phone user does not have a 3G or 4G signal in their current location, the mobile phone signal will switch to a 2G network.
3.Data limit: When the monthly traffic** reaches the current limit, the phone will automatically disconnect from the data connection, causing the phone to become a 2G network.
4.Dual-SIM dual-standby mobile network signal is switched: When setting the network mode of dual-SIM dual-standby mobile phones, the data card may be set to 2G signal.
5.SIM card abnormality: If the SIM card is dirty, oxidized, and the shape is not standard, it may affect the signal reading, so it is recommended to keep the SIM card clean.
6.4G switch is not enabled: Check whether the 4G switch is enabled for dual SIM, if it is not enabled, the system will not recognize it, and it will become 2G.
7.Special configuration of some networks: There may be a temporary 2G signal problem in some network environments, which can be restored after restarting the phone or switching off the airplane mode.
8.If the telecom card is used as an additional card, it may not be able to register for the 4G network: If the telecom card is used as an additional card, there may be no 4G signal and the jump to 2G may occur.
2. In order to recover to the 4G network, you can try the following methods:
1.Check if your phone is in arrears, and if so, top up your bill.
2.Try moving to an area with 4G coverage to check if your phone can receive 4G signal.
3.Try restarting your phone.
4.If it is a dual-SIM dual-standby phone, check whether the primary card and supplementary card modes are set correctly.
5.Clean up the SIM card, keep it clean and try to plug it in again.
6.Check that the "Enable 4G" option in your phone's settings is turned on.
7.Try factory restoring your phone.
8.If none of the above methods can solve the problem, it is recommended to contact the mobile phone after-sales repair service.
To sum up, the recovery of mobile phone 2G to 4G needs to be solved according to the specific reasons.
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