Interview: How Cellphones Change the Way People Learn:
"Rich Ling argues that cellphones strengthen ties with users’ close friends and family, but might also narrow people’s understanding of the world by limiting interactions with strangers. Mr. Ling is an adjunct research scientist at the University of Michigan and a research scientist for Telenor, a Norwegian telecommunications company. He’s author of a new book, New Tech, New Ties: How Mobile Communication Is Reshaping Social Cohesion (MIT Press, 2008).
Q. How are cellphones reshaping social connections?
A. If you think about social networks, there can be strong ties and there can be weak ties. The mobile phone is really an instrument for the intimate sphere — your closest family and your closest friends. But weak ties are also extremely important because that’s where you get information about important things. If you only spoke with your strong ties, you just hear the same things being echoed back and forth.
Q. What does that mean for a college setting?
A. It raises questions about emancipation. I grew up in Colorado and went to college in Boulder. It wasn’t that far away from home, but I hardly ever called home. I would come home every other weekend just to do my laundry or something like that. It was only like an hour’s drive. But I understand that college students now call their parents quite often, several times a day. So how is the child’s emancipation from their parents going? Are they establishing themselves as independent individuals that are ready to go out into the world on their own?
Q. Does text messaging have a different impact?
A. It’s sort of under the radar. Quite often when I’m lecturing, halfway through the class I’ll say, ‘How many of you guys have gotten a text message since you’ve been here?’ And a third of the class or something raises their hand. It’s kind of interesting that their social world is going on in the background while they’re more or less paying attention to the lecture.
Q. More or less?
A. Yeah, hopefully more. They kind of sort of zone in and out. And that’s sort of an interesting aspect of it. It’s not very interruptive; it goes on in the background.
Q. Can that be disruptive though?
A: There are all kinds of awkward social dynamics associated with having to deal with the mobile phone."—Jeffrey R. Young

(Via
The Chronicle: Wired Campus Blog.)
In my classes students mostly have their phones off and very little disruption takes place. That's because it's a studio/ lab and students can go outside to talk on the phone. We have, at various times, talked about the phone's influence but, I think it's only one of many things that allow the student to be unengaged with the learning process unless, of course, that student is really interested in learning. Just that fact reduces the number of serious students dramatically compared with those who are just floating by.