You can receive short messages, but you can't use traffic.

1. It is recommended that you uninstall the system security software, enter recovery (shutdown, press and hold the volume increase+power on key to enter recovery), clear the cache, and try to recover.

2. Please back up your data, enter recovery to clear all data (power off, press and hold the volume up+power on button to enter recovery), upgrade your mobile phone to the newly developed system with a wire brush, and don't install third-party system security software for the time being to see if it can return to normal.

I hope the above reply can help you.