I'm currently in-flight on a legacy carrier on a coast-to-coast flight. Lights are dimmed in the F and Y cabins. The Y FAs are sitting in the last row of the plane, minding their own business. I headed to the rear galley to stretch and grab a cup of water when I realize that one FA is using her personal iPhone and that airplane mode is not on (I know it's not on because she actually has 3 bars and the airplane icon is not in the top left corner).

I kind of want to call her out ... what would FTers do?