How does a text message crash the iphone?

Recently, foreign technology players have discovered a program vulnerability of iPhone! If you receive a text message composed of some special characters, your iPhone may crash immediately.

Specific circumstances:

Just send (white flag emoji +VS 16 characters (not displayed)+number 0+ rainbow emoji = rainbow flag) to the iPhone using iOS 10 system? ), whether the other party opens this message or not, the mobile phone will crash immediately after receiving this message.

But at present, this kind of information content can only be accessed through Mac.

Copying it, then pasting it into a memo, and then sending it to the iPhone will crash the App that receives the information.

Some developers say that synthesizing two emoji patterns will take up a lot of mobile phone memory, which will lead to instant crash. This loophole is used by many people to "cheat people". However, it should be pointed out that this prank is only effective for iPhone with iOS version 10. 1 and below, and devices with 10.2 or above need to accept a file before they crash.

Event view:

Some people say that the function of VS 16 character is to let the mobile phone merge the left and right characters. Specific to this short message, its original purpose is to let the mobile phone combine the white flag and rainbow emoji into a rainbow flag. Because the latter is not an emoji, but a combination of white flag +VS 16+ rainbow. When the iPhone synthesizes rainbow flag symbols, it needs a lot of emoji processing, which takes up all the resources of the mobile phone, but when the iPhone processes these contents, it will return to normal.

In other words, VS 16 tried to combine the white flag emoji and the number 0 into one character, but in fact it tried to give up the combination of rainbow and white flag, which eventually led to the system crash.