There's an iOS vulnerability affecting iPhone, iPad, and even Apple Watch that allows for a denial of service.

Crashing a phone with an SMS? That's so 2008.


S60 SMS Exploit Messages

Unlike 2008, this time kids are reportedly using the vulnerability to harass others.

Apple is working on a security update. But unfortunately… that update very likely won't be available for older iPhones.

Updated to add:

Here's the "Effective Power" exploit crashing an iPhone 6:


Effective Power Unicode iOS hack on iPhone 6

And this… is Effective Power crashing the iOS Twitter app:


Effective Power Unicode iOS hack vs Twitter