> Then why do so many kids scream their heads off and have temper tantrums when the phone is taken away?

Taking things away as a method of enforcement doesn't seem to be all that effective and it undermines the kid's self determination. The only thing it does make kids angry and disappointed. A lot of kids have to live by arbitrary rules that don't make any sense, or if they do, haven't been explained to the kid. "Go to your room" and taking things away need to go away from the parenting toolkit, they just lead to kids who get accustomed to going behind the parents' back.