As long as you do not owe money, you should be able to connect to the mobile network normally. It is recommended to check whether the phone Settings are correct or damaged. If you refer to the wireless WiFi network, it depends on the service package you use does not include wired network services, if it is to check whether the functions of the optical cat, router, mobile phone and other devices are normal. If still can not solve, suggest the information service provider.
Then turn it off and restart, or turn it back on when airplane mode is off
Then we'll have to call the appropriate people and let them decide