I updated to iOS 6.0.1 yesterday and my iMessage and Facetime worked fine. However, I logged out of my Apple account on iMessage, and Facetime, and they both quit working, when I tried to log into them again. I would put in my email adress and password, but they would be rejected. I changed my password, and tried again, but I was continually told the username or password are wrong. I tried resetting "All Settings" and "Network Settings" as well as rebooting my iPod, but nothing seems to happen.