So I screwed up when I first tried to set up facetime on my new iphone 6. I opened the facetime app and got a black screen with white text on it asking for apple id and password. The text I typed in, however, was also apparently black because it was invisible. I wasn't sure if I had typed it in wrong, so I hit backspace as many times as I thought was necessary, and then submitted. Now, if I go to settings > facetime, underneath the switch to turn facetime on or off, there is a button the width of the screen with the title "Use your Apple ID for FaceTime". If I click that, a screen swipes up SUPER briefly with my correct apple ID and a place to enter a password, but it appears literally for less than a second. It disappears and is immediately replaced with a popup box: Apparently when I was typing in black-on-black invisibly, I garbled my apple ID. And FaceTime now has that garbled ID permanently stored. Obviously whatever password I type in will fail, since that is not a real Apple ID. And in fact it would be impossible to create one matching that email address since it has two "@" signs in it and is not a valid address. The same dialog pops up if I attempt to click "Add An Email..." Turns out I can make and receive facetimes anyway, but if I want to enable anybody to facetime me (e.g. from overseas) via my iCloud email for instance, I can't. People can only facetime me at my phone #. Apple tech support seem stumped by this -- they are thinking the only solution may be to wipe the phone and set it up as new, which I'd rather not do.