Need help with wet iphone

Hi, i went to a party this friday and i fell in the pool with my iphone 4s in my pocket i got it out quick but the screen was all black, i came home and i did the rice trick and i opened a few minutes ago and i can hear sounds and it vibrates but the screen is all black. i dont have the money right now to buy a new one, i bought mine october 2012 but not at the apple store i got it with my plan with my phone provider so what can i do? thanks for your time and sorry for my bad english.