Shortly after I took the phone for a dip (in not very deep water), the display went kaput — at least for several hours. It lit up just long enough to indicate that I had power, but I couldn't actually keep the display on and use it.
Roughly a day later, the screen came alive again, but the phone was still exhibiting finicky behavior, presumably because of water damage. The touch-screen was messed up and the device acted as if headphones were plugged in when they weren't. If this were my actual phone, I'd return to the store for a replacement.
I just got the S4 Active and thought I am not planning to take the phone for a long underwater activities, I am concerned that I am getting a phone that have a very weak water resistant feature.
Not sure if this is because the reviewer didn't "properly" close the battery cover / USB port, but I have seen S4 Active review and Samsung Event videos where the phone was submerged in water for a long time and it still works.
PS: Have ANYONE tried to dunk their phone in the water for testing?