well for some people family time is as important as their jobs, I get that some people need to escape the troublesome nature of their families at times hence resorting to the use of mobile phones even when it's family time.

I think most people encounter this kind of problem in a big family setting like the extended family system. I for one have been under such a rule where we were banned from using our phones at the dining table, it was implemented perfectly cause the one who implemented will give you a sound warning if she saw you with your phone. The rule can actually work, it's just a matter of priorities to me.