iPhone 4s not working even after the rice dry method . What to do?

4 days ago my nephew dropped my phone in the commode while I was sleeping. Thankfully my sister says she took it out immediately but the water obviously went inside. When I asked her if she switched it Off she said it went off itself and the flashlight at the back remained On. After that she kept it in the rice box, tightly closed. I took the phone out after almost 50 something hours and connected it to the charger but it did not switch on so I kept it back in the rice box and today I took it out again after 48 hours and it is still not switching On. Someone please help me. I really need to switch this on.