Caller ID Profiler

My other half often borrows my smartphone to make calls, and occasionally my friends do, too. The idea is to have a caller ID profile assigned to each of them, and use the front facing camera to identify the person calling out when they start dialing. This triggers that person's name/picture to appear on the caller ID of whomever it is they are calling. So basically, if my buddy Joe calls me from his phone, my caller ID will pop up Joe's name and picture. If his girlfriend calls me after he's gone to sleep.... Well, it'll display her name and picture and say "Ashley calling from Joe's phone".

A side benefit is that it could also be used to display an up-to-date contact photo every time someone calls. That would have to be enabled on both ends, and could be disabled from either end.

Probably requires a companion app on the phone being called, but it might also be able to synch with carrier caller ID databases and if that works, it could display the actual caller's ID on landlines as well.

If you want to get extra-complicated, users could upload a photo of themselves to a central app database. That way, if you have to borrow a stranger's phone (provided they also have the app installed) to call someone who has you in their contacts, it'll still display your name and photo and say "[your name] calling from stranger's phone".