I've worked in electronic repair and have a good few friends who work in this side of the(Phone repair) industry and they're told from the bean counters/process engineers that if it looks like water damage -scrap it.Why,basically the cost of repairing your phone is a multiple of labour cost x parts x through process time=(Unpacking/repairing/data collection/cleaning/repacking/shipping),and even after all of that the phone may still not work,become intermittant!...why... well the water may have damaged the fab on which the chips are placed or started it to corrode it(it has copper)and as they generally give a 3-6 month warranty on a repaired phone the costs of re-repairing this phone is even more uneconomical,...if your phone was an easy fix etc they make money returning it to you,plus for them to tell you it was unrepairable they may have gone through some of the steps above...having said all of this the previous replies about letting it dry out can work depending on the type of phone and casing you have...but you're odds are not good...you've nothing to loose...hope this gives some insight...