I dropped my digital camera in a river on a backpacking trip (it was me or the camera, had to grab onto rocks unexpectedly). I managed to fish it out with my trekking pole, pulled the battery and let it sit in the top of my backpack for a couple of days. I thought it was completely drowned, but I put the battery in just for kicks and the little bugger turned on! I was elated. Bottom line, all hope isn't lost - I didn't have any rice in the backcountry, but you've got plenty. Follow the advice in this thread and odds are your phone will come back to life.