Dua for something you really want?

So i entered a compotition to win an iPhone 5s and i really want it.
Please could you tell me a duaa or something else to help my wish come true.

Added (1). islamic dua's only
no other things like just dance around in some grass skirt!

Here you go:

You've already done all you can do by wishing. The only difference between that and praying is that with praying you've convinced yourself that someone else is listening.

I just dance around a bonfire in the pale moonlight wearing a grass skirt and shaking a rattle. I've found it to be as effective as any form of prayer.

A person can know for certain the Catholic Faith is the True Faith, and know for certain a carefully-said novena of is extremely powerful, if he or she practices devotion to the

http://www.marian.org/13th/howto.php

I don't know how to do a dua.
Please do a dua to help me learn to do a dua.