I’ve heard many people say they were able to fix a water damaged phone by putting it in rice. If this actually worked then the phone was not really water damaged to begin with. Water causes corrosion and by putting it in rice you are just letting the corrosion build up on your motherboard. The best way to fix a water damaged phone it to get it to someone ASAP who can run the motherboard through an ultrasonic cleaner with a sweep and Branson EC cleaner. The sooner you do this, the better your chances are of have a fully functional phone.