Yeah, but I can also see them wanting to have an emergency contact in the phone. If only one of them was hurt, no notification will need to be made because the other is right there; but if they're both hurt, then Bobby is the logical choice as their emergency contact.

Fortunately the monsters so far haven't appeared to be terribly tech savvy. Although I now have this image in my head of the wendigo from season 1 sitting in his cave with a satellite Internet connection for his laptop and watching videos on YouTube.