"Next time a teenager says, 'Mom if I don't have a phone,' or 'Dad, if I don't have a phone, I'm going to be a nobody,' they are being serious," said Robbie Blinkoff, Context's principal anthropologist. Blinkoff and his colleagues studied the behavior of 144 cell-phone users between the ages of 16 and 40 from several countries and found that teenagers were so immersed in the technology that they often saw little difference between meeting face to face and talking on the phone. A common scene they observed was a group of teenagers sitting together -- all with ears glued to cell phones -- talking with faraway friends rather than to each other.