FA's do not know the altitude. The announcement comes down to when steril Flight Deck Begins.

Not to be rude, but when I am given my indicator to have all electronics turned off. That is when it happens. I am just doing my job, as the company has told me to do. If one would like to make an issue of it, and refuse to turn them off. Then I would have no choice to fill out an incident report, and that would come with a fine from the FAA.