Can my Iphone 4s be fixed or am I going to have to get a new one?

Yesterday I dropped it in the sink while doing dishes (I immediatly put it in rice) and now the sound still works and I can still talk to siri but the screen is black, can it be fixed or am i gonna have to get a new phone?

With iphone 5C free on a 2 year contract, and iphone 5S $49 in some places, why would you still be using 4S when you could also trade that in and get credit for it?