I really want an Iphone for christmas

So christmas is in a few months, and i really want an Iphone. I'm in middle school. But the thing is we have a very small school with only 25 people in my grade. Everyone except for two people have PHONES. And i counted, 10 of them have either an Iphone 4 or Iphone 4s. My 2 year contract with sprint is up in a month or 2. I have been asking my parents for the past 2 years to get one. But another thing is that the reason everyone has so many iphones at my school is because its a private school, so yeah. And my brother is 4 years older than me and has the same phone as me right now (it sucks) and his contract is up this month. And i'm just assumign if he doesn't get one then i won't for another 2 years:/.So how can i persuade my parents into getting me one for christmas! Please don't say i shouldnt even be getting one for my age, thats not what i'm asking people to say.

Added (1). Oh and i'm not kidding when i say if i get an iphone for christmas ill just off the walls and scream and cry.

Maybe you should write an essay about why you deserve an iPhone, and how it would benefit you and your family(:
But don't be worried if you don't have the iPhone. I'm a freshman in high school and I don't have any kind of cell phone. No one is going to make fun of you if you don't have the right cell phone, trust me(:
And what's wrong with your old cell phone?
If you're serious about getting the iPhone, ask your parents if they'll go 50/50 on the money. Talk to them about why you want it, and why it's better than your old phone.
Good luck and don't be bummed if you don't get it(:
Hope this helped!