Unfortunately our modern life revolves around technology. My DGS is on phone constantly, his mother gave him a phone for all the reasons already stated at 11 going to high school. Not being used in school is fairly normal these days is it not? Put in bag, switched off, confiscated if used. As others said a particular type of 'smart' phone should be the norm for under 18s. Hugely restricted.
Schools can only do so much, as long as they don't encourage social contagion, and ban school day use of phones ( switch off, put away, removal for transgressions). In other words apply rational common sense.
I'd have more support for Esther's campaign if she stopped referring to her child as a daughter, etc, she had a son, she supported her child in delusional behaviour, that was also encouraged by his online presence. She would have more impact and power by admitting that a combination of factors, including phones/ internet and social contagion led her son to become a victim to sadistic bullies. Sometimes we make poor decisions while trying to keep our loved ones happy. I do feel for her as she tries to make sense of her child's death, but gaslighting others isn't the way to do it.