All those people saying you need to dry it thoroughly... Yes but only after you've rinsed the salt water out. There will be practically irreversible corrosion after less than an hour with sea water inside it. If you can't get the phone apart immediately, immerse it in fresh water. Distilled water won't make much difference because it won't be distilled for long (i.e. it will have traces of seawater in it). Take off whatever covers, battery and cards you can, and get the phone immediately submersed in fresh water and try to shake it about a bit. Running it under a tap is better than nothing. Isopropyl alcohol might be better, but I have no experience of this and people don't tend to take it to the beach. As soon as you can, the phone needs to be stripped down to its component parts and rinsed more thoroughly. If you can already see rust on the metal contacts etc, it's probably borked. Only when it is properly rinsed inside out should you dry it (rice, >24hrs). This has worked for me.