My iphone 4 fell into water still kinda works what do i do?

So i dropped my phone in water i have an iphone 4 and the screen turned all black and wouldnt even turn on i dried it up and put it in a bag of rice For three days after it worked well kinda like i can answer a call and take pictures and Everything just that my screen is still black. Should i go to apple and get a refurbished phone how much would it cost since its water damaged?

Turn it off and let it air dry for 2 days.

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