phone is entered in water

sebastian, since you asked a generic question, you can only expect a generic answer. As with any water damaged phone, you need to be aware that the chance are always slim to get it back to normal. the longer you wait the less of a chance. It is imperative that you do not use the phone, remove the battery. Disassemble the phone and clean all the parts with high grade isopropyl alcohol and a soft brush. Repeat this process a few time. While you are cleaning it, check for any missing, corroded or otherwise suspicious looking components. Once it is properly cleaned, replace the battery and reassemble. Then reevaluate for any damage. Hope this helps, good luck. and try to isolate