My phone appears to be irredeemably fucked at the moment. I get messages on startup about how I need to wipe the data partition (no idea how to do that), the default web browser crashes instantly, and while I can download new apps they won't install or save.
That's just swell.
Look up the make and model online, or call the provider (on a different phone). You can figure out how to perform a factory reset, which should fix it; just make sure you've backed up any pictures or whatever you want first.
Managed to do that. Now my phone appears to work again, yay! Of course, I still lost all my contact info, but like previously mentioned it was only four people.