My iPhone Literally Gets Full When I Connect To Computer 0 bytes available even though the apps on my phone aren't close to filling the 16GB. I don't sync with iTunes, all I do is debug apps with Xcode. On iTunes it shows that "other" mostly fills it up. It's iPhone 6 Plus OS 9.2.1.

I have already hit "Erase all content and settings" 3 times, it works until I connect it to my computer and debug an app I'm working on on Xcode - (I delete the app after I use it too).
Because Autofill is on In your iTunes, 
Simply Connect your phone to iTunes then Go to Summary then Uncheck Autofill.