Sorry if it sounds rude, but I have a much better idea: find a way to bring them into the conversation you're having, try being more interesting, change the subject to something they might want to participate or just leave them alone for a bit. Some people need to "recharge" by being alone.

As vinceguidry put it on another post, "We use technology as a way of filling in parts of your life that would otherwise go wasted with something that could be more meaningful."