Those text message principles that can make the MTK platform mobile phone black screen

There have been several so-called "virus text messages" that have become quite popular recently. However, unlike previous mobile phone viruses, the spread is not between smartphones, but in ordinary mobile phones of most people. . The general format of this type of text message is: the content is written vertically (just to let you keep turning the page down), and the bottom is a music symbol (actually an .imy audio file. Here is an explanation: "iMelody Ringtone Format" is referred to as IMY format was Ericsson's favorite ringtone format in the past. It also has the characteristics of small space and easy editing. Therefore, it was once used as the ringtone standard by EMS (Enhanced SMS), so China Mobile also complies with this standard. Such files can be included in text messages. When sending text messages, select "Insert Object" --- "Insert Ringtone" to insert the corresponding ringtone). Once the text message is pressed to the last line (the music symbol is displayed), the phone will generate Different reactions (according to different music symbols), such as constant vibration, continuous screen flashing, continuous black screen, freeze, etc. But the premise for these situations to occur is that the "scene mode" of the mobile phone is not "silent mode", "conference mode", "vibration mode", etc., because the mobile phone does not play the sound files contained in the text messages in these modes.

In fact, what causes these situations on mobile phones are just a few specially written .imy audio files (just like the special statements constructed during sql injection

)

< p> Regarding .imy files, I compared many similar files and consulted relevant information on the Internet. I found that both normal .imy files and those "special" .imy files follow this format:

BEGIN:IMELODY

VERSION:

FORMAT:

[NAME:]

[COMPOSER:]

[BEAT:]

[STYLE: