UFC's Luke Rockhold -- MURDERING IPHONES ... With His Bare Hands!!! (VIDEO)

Forget breaking bones, UFC superstar Luke Rockhold is all about breaking PHONES -- beating the living crap out of the new iPhones with his bare hands ... and it was all caught on video.

This footage is awesome ... Luke teamed up with an electronics warranty company called SquareTrade to show that iPhones may be tough ... but they stand no chance in a fight with an MMA badass.

Check out the clip ... Luke executes a death blow to SIRI using a brutal spin kick -- and then snaps the phone's neck like a chicken bone.

C'mon ... you've all wanted to do this to your phone at some point -- so, feel free to live vicariously through Rockhold for the next few minutes.