Question about phone falling in water?

My phone (iphone 4) slipped out of my pocket into the toilet for a split second. It literally was completely submerged in water for one second. I took it out' wiped off the watet and dried the ports as best i could. Everything works completely normal on it. Initially, the ipod loudspeaker wouldnt work but it randomly started working out of nowhrere 5 hours later. It has now been 18 hours since it fell in and works normally. Ivr even charged it and its still normal. Is it possible that there was no true water damage? Or should i be expecting something futurewise?|||maybe you should go to an electronic shop and let them check to see if anythings funny about ur iphone!!! thats what i would do but its up to u|||You are probably one of the lucky ones.