The continuing logical fallacies in this thread are at least threefold:
First: cellphones (particularly older ones) can and do affect the instrument panels on the CRJ series - as in can make them all go black when searching for signal... I once saw it over a crew's shoulders when they found a phone that could do it and we were in a safe spot to do the, "Hey would you look at this!" I've been told larger planes are 'hardened' against that interference, but then... all things being equal, it's not a perfect world. (SkyWest flies mostly CRJ series aircraft.)
Hence, the rule. And yes, Super80fan, et al. It is FEDERAL LAW, your phone should be in Airplane mode or off as of the moment the aircraft door is closed. Not, the fourth time we ask, not the moment we tap you on the shoulder as you text, and not as you keep talking.
Second: As a FA, we announce before we close the door that this is what you need to do. We repeat it after or as we close the door. So, if that's the FAA's two, what does that make the next two times we have to say it? On a Delta Connection flight, I often had to say it every two rows. Why? Because I had passengers with Listening Disabilities who were either texting, talking, snapchatting, or faceplanting actively on their phones. Funny thing, your cell carrier shows in the upper left corner if you aren't in airplane mode. Even if you aren't obviously texting, it gives you away. And while we are looking to see if your seatbelt is fastened, we look at that too.
Third: Even with all of these incidents where people point at and say, 'Just look at the video!' Did you ever notice that the video doesn't start at the real beginning of the adventure? It's like an Action film, you start mid-crash, not at 'once upon a time, there was...' If we started this as the passengers walked on the plane and heard every announcement, we'd be in a good position to evaluate this. We just aren't, because it doesn't give us the real beginning. We don't actually know if there were one, two, or seven prior, gentle, polite requests from the FA to this passenger.
I would quietly bet the Captain said to the whole crew well before boarding, "Anyone who gives you trouble is off the plane." Making this not really a negotiable. Again, we do not know the whole story. And what would have been easy to make 'no big deal' wasn't when the neighbors jumped in filming and advising.
Every single rule and regulation that we list, describe, demonstrate and inform/enforce has pretty good reasoning behind it. Some may feel antiquated, or not make sense on the surface. They all have solid reasoning behind them and really are designed to keep you alive. Now, I won't tell you that every single working flight attendant understands all of them. But, not a one of them is arbitrary or stupid.
I appreciate all of the 'armchair aviation specialists' who'd like to "absolutely declare" that cellphones can be left on and in transmitting mode. Do that, in any other country. Here, the law says you may not. period. Will we all die? Hopefully not, if you forget. It happens every day. Because it does, cellphone frequencies changed to try to reduce it. Does that mean you should be an arrogant donkey and ignore the request to switch them over? No. We all do the best we can. Please do the same.
One last note - regarding that demeaning phrase 'sky waitress' - just so we are all clear - if you want to call me that, I expect you to tip me 15% of your ticket, in cash. My company pays me only from when the door on that plane closes, until it opens. So, while I am saying, "Hi, welcome" and "thanks, have a great day!", I am off the clock. That's a standard. It's true of your pilots too. We do make a pittance in per diem for meals. And that FA, may have been on hour 11 of 14 since she started her day. Not paid hour 11, just the 11th hour since she left the hotel room for the day. Something to think about.
I am happy to pour you a drink, and hand you cookies. But behind my smile when I am looking at your seatbelts as I walk through the plane in the beginning; please remember that I really am conscious of whether everything is stowed for a crash, and who might need help to get out. - That's what I really do, so that you don't have to think about the worst case.