so, facial recognition for the phone...
you have just been beaten half to death for your money, they left the phone because it wasn't an apple or other known expensive product, you want to call for help, it tells you "you're not my owner" and will not activate.
yea... i don't want retinal scanning, fingerprint, or facial, even voice, all of these things can easily get messed up or change just enough to lock you out of something important.
i don't want fingerprint scanning in fear of a mugger deciding it would be a good idea to take a thumb too, retna... that is an even scarier prospect. face i doubt someone would try to steal, but i have seen enough people get messed up to the point you couldn't tell who they are anymore (to be fair i have seen people get punched in the face and everyone around me tells me "look how bad they are swelling" but i cant tell a difference) and a fingerprint... how many of us have cut our thumbs or just any finger, you really want that locking you out if lets say you were in an accident?