Smartphone DNF SMS can't disarm the security mode.

The mobile phone enters the safe mode because an application in the mobile phone is not compatible with your mobile phone system. You just need to restart your phone. If this happens frequently, you can also use Tencent Mobile Manager to detect the mobile phone and uninstall applications that are incompatible with the mobile phone, so that this will not happen.

Tencent Mobile Manager is a free and professional mobile phone security and management software, with self-developed cloud killing technology, which can provide you with user traffic monitoring, space cleaning, physical examination acceleration, software management, as well as mobile phone health examination virus killing, sao interference interception, software rights management, mobile phone DA0 prevention and other security protection.

If you have any other questions, you can keep asking. I hope you can adopt them. Thank you.