From The American Institute Of Stress:
“One might think that cell phones would reduce stress by facilitating contacting someone in an emergency or transmitting time urgent information but a recent study suggests otherwise. A sociology professor who followed more than 1300 people found that those who regularly used cell phones or pagers “experienced an increase in psychological distress and a decrease in family satisfaction” compared to those who used these devices less often. No such effects were seen in others who regularly used e-mails.”