I really want to break this girl's iPhone.
You're kidding, right? Why do you want to break her phone?
She keeps bothering me to show her how it works. I don't want to hang out with her anymore.
That doesn't even make sense. If she's bothering you, breaking it would only have her bother you more. Besides, you shouldn't break someone else's things.
You're just jealous of my superior intellect.
If you're as smart as you think you are, that's probably why she's asking for help. You could tell her to ask someone else instead of breaking someone else's property and possibly getting in legal trouble for it.