One thing I learned from observing the teenagers of my friends is that they don't want this either. We're adults and talking and a bunch of kids sit in a row on the couch, playing with their iPads. For hours on end.
And yet they hear everything you say. They're paying attention. And when you show a genuine interest them just by asking a few question, the iPad is quickly ignored.
That's a sign of hope. They want to engage and be engaged in something more meaningful. The iPad fills a void. This artificial divide of the situation between adults and children does not help. Sending them outside does not help either because nobody else is outside.
Engage with them. They have a bunch of free time on their hands but no meaning to fill it with. You can't stop the draw to the device unless that time is filled with things that makes them forget the device. It doesn't take much. A conversation, a board game, a small game of sports in the park, whatever possible for you.
I would admit though that the situation for girls is not this simple. They will be dragged into a games of thrones style social battle of self-image/worth.