How to write the code to make the phone screen black via text message? Please help me.

The format of this text message is: (blank line) Note (blank line) Your phone will have a black screen for one hour (blank line) Believe it or not... (blank line to the end). Within these blank lines, a music prompt is implicit. It is this music prompt that makes the phone screen black. Finding a text message is only available on the domestic MTK mobile phone platform. It should be a vulnerability in MTK. It is useless on Nokia and other smartphones