If your iPhone has water damage, there are a few telltale signs that you should look for. First and foremost, your iPhone will likely not turn on. If it does, it may only work sporadically or not at all. Additionally, water damage can cause your iPhone to become unresponsive to touch or to respond slowly. Finally, if you attempt to take apart your iPhone to dry it out, you may notice that the plastic around the screen and buttons has become brittle and cracked. ..