I really hope your sister is an actual child, because in my eyes, she is either prepubescent or a sociopath.

How old is she ?

I guess it's time for the solution to every sibling issue: Bring in the parent(s). It should be pretty obvious to them that you've worked hard to get the phone, maybe they didn't want to borrow you money for it, and that you would be old enough not to break your phone that quick. Hopefully your sister will have to pay for another through your parents and get grounded for a solid three months with no fun stuff lying about her room.. Depending on her age, you could rip off the head of one of her favorite dolls or something similar to ehat she did to you, using the same excuse as she did.

That's some twisted reasoning but she's kinda right

I agreed, your life sucks. But lesson learned. if you let her use it again and she breaks it and I see you back here with the same story... I'm gonna vote that you deserved it because you didn't learn your lesson. lol. Good luck!

As nobody brought it up: YDI for getting a phone you need MONTHS to earn for. If you can't live without a phone you can't afford to replace, insure it ;)

That sounds awfully close to what a rapist would say...

Break something of hers with a similar excuse

Well, if she didn't want you to break her jaw, she should've been wearing a hockey mask! All the time.

You use that word "fair". But I don't think it means what you think it means.