This changes things a bit. It's no longer "I'm distracted because someone else is on their own phone." It's now: "I'm not getting anything out of this class and we're not accomplishing what we're supposed to be doing because my knucklehead teammates won't pay attention."

This is probably where some communication skills would come in hand. I have no problem with a quick "Hey, nilium, can we please just get this done?" or "Your hot date can wait for you text".

Granted, I've also been very lucky in having self motivated or self chosen teammates for most of my university group work.