It is suggested that the following methods be adopted to check the causes and solve them:

1. Check whether the network switch is turned on. The mobile phone needs to turn on the network connection function to connect to the network.

2. Check whether the mobile phone is in arrears. The overdue mobile phone can't connect to the data network and needs to be recharged.

3, Tencent mobile phone housekeeper's garbage cleaning, there is a mobile phone slimming, which can be used to clean up files on the mobile phone, you can use this to clean up junk files.