We have pretty tight control over their access. They do not have their own phones nor tablets. We have a family iPad. We let them watch educational television in the evenings 2-3 nights a week (Thomas the train, Calliou, Magic Schoolbus, etc). We have a bunch of educational games on the iPad (ex: pettson's inventions) which they can play a couple times a week.
We dont play regular video games whatsoever.