I remember recently reading about a town where all the parents in the entire town agreed not to give their kids smartphones, so then none felt they were missing out. I think that could work really well
You can lead a horse away from water, but you can't stop it from getting thirsty. Reckoning with disparity is what helps kids grow up and shed the solipsism of childhood - take the smartphones away and you're leaving them even less equipped to deal with modern life. It's a catch-22, but I don't think banning everything digital is going to improve anyone's quality of life, kids or parents.