If by any chance you drop the phone in liquid .. it need to be taken to a service so it could be cleaned .. they put some "oil" on the mainboard and on the connectors so they do not rust.

I strongly recommend you to visit a mobile service ASAP. A friend dropped an old samsung and after 1h she took it to a service and its working.

If it has been more than 12h since it dropped, I`m afraid you are out of luck :(

Sorry