Introduction to crash text messages

"Crash SMS" is also called "black screen SMS" and "copycat SMS". The core part is the imy file, which is usually the hidden music symbol. Different mobile phones will have different reactions when encountering this kind of file. They may vibrate, black screen, flicker, or even freeze. It is said that copycat phones and low-end mobile phones may freeze because they cannot recognize this kind of file.

The "crash text message" does not cause the copycat phone to actually crash

Regarding the claim that the "crash message" caused the mobile phone equipped with the MTK chip to crash, he solved the mystery for the reporter from a technical perspective, he said , "Crash SMS" inserts spaces, vibrations, musical notes, flash and other effects into ordinary text messages. When the mobile phone reads the text message, the same effect as "Crash SMS" will appear.

It is understood that iMelody (iMelodyRingtoneFormat) is referred to as imy format. It is an audio format proposed by Ericsson in 2000. This format can insert spaces, vibrate, music and other effects, but there are not many mobile phones that support the playback and ringtones of this file format.

IMY is one of the common MMS file formats stipulated by China Mobile, but not many mobile phones support playback and ringtones of this file format. It also has the characteristics of small space and easy editing, so it was once used as a ringtone standard by EMS (Enhanced SMS).

IMY is a monophonic format (not polyphonic), and notes can be written directly on the mobile phone.

According to the IMY format syntax, the text message you generally receive is a flash vibration code:

(ledoff ledon, backoff backon, vibeon, @0)

[Switch LED (flash), switch background light (flash), turn on vibration], repeat infinitely

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IMY basic format analysis:

BEGIN: IMELODY

VERSION: lt; versiongt;

FORMAT: lt; formatgt;

[COMPOSER:lt;composer_namegt;]

MELODY:lt;melodygt;

END: IMELODY