I suspect I'm taking jaime2000's situation a little more seriously than perhaps I should. If one is considering rearranging one's life around this for many years, that's not a matter of a little inconvenience or simple "prevent devices I own/carry from internetting". It's a matter of "don't associate with people who aren't supportive, and deny myself access to kiosks, public wifi, borrowed tablets, etc."

If your concern is that you'll end up on the street offering sexual favors for a glance a wikipedia, having a net nanny on your computer at home isn't sufficient.

Now, it may not be that it's a harmful serious addiction that he or she is facing, and the original post was overstated. Identifying the underlying problem is necessary before suggesting technological band-aids.