how to say these?
when you hit a key on the side of your phone, then your phone will be locked and no matter whereever you touch on the screen of your phone, it is always locked, but appear the wallpaper. Question1: what's the name of this wallpaper? lock-screen wallpapar? And is it called lock-screen(noun)? Question2: when you unlock your phone, what action do you do? move your finger on the screen to any side?
Thank you very much!