If your mobile phone soaked on salty water (means you're in the beach having fun and suddenly you saw your mobile swimming already);

Don’t try to turn the phone on, don’t try to use its touch screen, don’t press any buttons and don’t use the phone at all.

Removed the battery, sim card, sd card right away.

It sounds odd but since your phone was dropped in salt water, you should seriously consider giving it a wash in 99% isopropyl alcohol and try to get the alcohol to go into the phone and try to get the salt water out of the phone. This should help remove left over salt water and other potentially unwanted minerals from the phone.

Let the phone sit and dry overnight or however long it takes for the phone to dry completely. Dried rice can help speed up the drying process as well. It shouldn’t take too long to dry as alcohol evaporates pretty quickly but letting your phone dry overnight is never a bad idea.

Hopefully the alcohol has worked its magic and with any luck your phone will be back to 100% again.