What is your strategy when someone asks to borrow your phone? Say your phone contains some information that you really do not want that borrower to see (be it a secret contact, a photo, bookmark, whatever), but the situation makes it practically impossible to deny lending another person your phone for a couple minutes - out of your sight. Say you are out of office with your menacing boss and he gets the message his wife has been in a car accident. And then his phone battery dies. He urgently needs to borrow your phone for several minutes. What do you do? A) You simply say: "No! My phone is my private property! You may not borrow it. I do not care if you wife is dying. No!" B) You hand him the phone, praying to God that he not open the SMS application or photo gallery to discover the secret affair you were having with his daughter last night. C) You activate "guest mode" and hand him the phone, knowing he will not be able to see any of the information he should not see. D) You transform him into a newt using an ancient magical incantation. Come to think about it, my question can probably be summed up like this: What kind of "guest modes" are available for Android, and how do they work? Thanks!