Why can't I make a phone call after using Hi?

Yes, it should be your mobile phone. This kind of software is generally error-free. What? How to cook oysters? This is the problem of incompatibility of mobile phone software, right? You uninstall that mobile phone software and see if it can return to normal. If you want to return to normal, this software is incompatible. Try other software to see if you can make a phone call.