lmao just go ahead and try, doesn't matter to me.
You can stay off the grid, and deny your kids access to it, but you can't stop the advance of technology itself. Eventually your children will be left behind, ostracized by their peers for being weird/lame. Maybe even paranoid for life as a result of your helicopter parenting. And of course, when they finally get a smartphone, they will have zero experience in managing its "addictive" capabilities, which probably won't help their adult lives either.
Source: anecdotal evidence of a friend who lives with depression and severe social anxiety as a result of similar experiences. Of course, there were other deciding factors that turned said person into what they are today. Make of this what you will.
i can tell you how this goes. when it becomes socially important to get one, she's going to do everything in her power to get one behind your back, turning her into an extremely skilled liar (since her entire life will revolve around this lie), a skill which she will use whenever an opportune moment comes up.