Limiting screen time each day. "You have 2 hours of screen time today." This solution may be great for some families, but often it results in children valuing their devices even more.
Taking away their devices as a punishment. Taking away things from a child to discipline them puts the thought in their heads that they can do the same if they want to hurt or punish someone. Forming healthy conflict resolution is imperative to children.
Banning devices from the household. Might very well be a fit for some, but for the majority of the population, it's a bit difficult to go off-grid. Completely giving in and letting them do whatever they want. On the other hand, banning devices may be an easy solution for some. It would mean trading being present and attentive in exchange for being worry free.