I have a phone holder for bikes but don't normally use it on the turbo as I have the mp3 player. If it makes you feel better I killed one of my mp3 players after dripping sweat on it too. So that's in the car now basically acting as a small USB stick.
Similar to what I was using, I just need a better place to put my phone (if this one survives) as I was only wearing bibs.
Stupid thing is I keep everything in a ziplock bag when riding outside.