How should I bring it up to my parents that I have a large desire to get a Blackberry Storm 2? I am only 13 in April, but for half of my contract (the second full year of my contract) I will be at boarding school and will actually need a smart phone. Could someone give me an estimate of how much it will cost per month as well?

And before anyone goes into work for it, I get straight A's and A+'s. The lowest grade that I've gotten all year has been a 95%. Also, I work very hard in sports and always perform well. This spring, I will referee for money (note that I will only be getting 10-12$ per game and this will only be for a month or two).