Why not both ?!
Video conferencing for the day to day, to replace impersonal phone calls. And it's not just the the inmates who would benefit from this, can you imagine the joy it'd bring kids, especially younger ones, who would get to see Dad ?
This is has a whole other awesome side to it; a lot of parents won't bring kids to prisons/jails, it's just not suitable. A lot of the incarcerated never even get to see their kids grow up. Now they can watch birthdays, speak regularly, show them the macaroni art. Damnit I'm tearing up here.
Can you imagine as well the power taking that away would have to encourage behaviour ? More than a lot of cons hold onto the idea of seeing their loved ones again. A constant reminder of what they look and sound like would be god damn glorious.
And of course, keep the face to face visits, because cutting off human contact that doesn't involve a shiv is downright barbaric.
And to to the prick who said "don't do the crime blah blah I'm a twat", don't be an insensitive bellend.
(mods feel free to remove that line if it went too far)