Blackberry water damage? HELP?

Ok, so today i dropped my blackberry curve 9300 in the bath. got it out straight away, dried it off, let it sit on radiator for 15 mins. worked fine again. i also used a hairdryer to dry it off, which supposedly i shouldn't have used? anyway, it worked fine afterwards for about an hour or so, then the screen went completely white. i did a battery pull, still white. so now i'm panicking slightly. i've put it in a bag of rice, with the sim card and the battery out. am i supposed to conceal the bag or leave it open, and should i put it in a warm area? does this sound like it will be ok? i'm planning to leave it overnight. if anyone has any tips they'd be much appriacted. thanks