Don't give up hope just yet!
Remove the battery, and place phone on a cookie sheet, and set your oven to WARM ONLY (under 170 degrees), then turn OFF the oven and wait a couple of minutes.
Place the phone/cookie sheet INTO the oven, and let it stay in the oven for an hour, to make certain the interior of the phone is being warmed to the same temperature as the case.
After an hour, you should have a toasty WARM phone, and it should be 100% DRY inside as well.
NO WORRIES....your phone CAN handle temperatures UNDER the boiling point of water, and NO damage will be possible, as yo are NOT going to bake it, only warm it up and remove the moisture from within!
I GUARANTEE you can NOT damage your phone.
I have been doing this for more than 20 years now, and recently, I had a customer bring in a commercial radio into my shop that was mounted to a small boat that sank. The radio sat in water for days, before he noticed his boat was floating only because of the flotation devices in the seat ribs and gunwalls.
The radio was opened, covers removed, and the oven turned on to 170 degrees, or the LOWEST setting you have. I let the oven shut off, then placed the radio on a cookie sheet and let it sit in the oven for an hour.
When I removed the radio, it was fully dried, no corrosion had begun, and a re-test of the receiver and transmitter sections proved it to still be within tolerance.
You CAN truly bring the dead back to life using this 'trick'...