I dropped my iPhone 4 in water. Second opinion please?

My phone fell in the water for literally no more than 3 seconds. I dried it off and it worked completely fine. When I got home I looked online to find the water damage signs in the back of the phone. The water damage signs were present in the charger port and the headphone jack although, they were not present in the battery part of the phone. Again, my phone is completely fine and has been fine for several months. I just wanted a second opinion months after the incident to be sure my phone would be okay.

So it sounds good now but that happened to me and a few months after it just died forever… It was a different scenario and different phone but still it won't last forever