It works anytime Anytime meaning: you can b talking to someone on phone and you can use this camera to take a picture. ...if your phone battery is at 2%  it will still take a picture  when other cameras won't  like the Google that refuses at 15%......this Camera is Not my proprietary. ...its my go to when battery is almost desd and I want that last picture or when talking in phone or using two other apps  this Camera Still Functions