the phone rings and i can't answer it.

[AC Question]

samsung 7s, phone rings and green phone does not appear. i can't answer the phone. i was told i might have locked it. i can't figure out how to unlock it. help

 

[B. Diddy]

Welcome to Android Central! You don't even see a notification in the status bar for an incoming call? Does this happen only when you get a call while the screen is asleep, or does this also happen when you get a call while you're actively using the device?