In Malaysia, mobile phones are so widespread that Muslim leaders send out S.M.S. reminders to call the faithful to prayer, five times a day. Muslims in other countries -- like Britain -- have begun using a service that tells them the prayer times in Mecca, which means they essentially live in two time zones at once: local time for their professional lives and Saudi time for their spiritual lives. ''They're existing in two countries simultaneously,'' Bell notes.
Of course, living in two places -- even virtually -- means being spread thin. Rich Ling, a sociologist working for Telenor, a Norwegian telecommunications company, has interviewed thousands of mobile-phone texters, and he has noticed that they actually feel more disconnected from the world around them. Consider it the mobile-age version of Bowling Alone: text-messagers are connected more tightly than ever to their core friends and family but are less likely to engage the civic life around them. ''When you're waiting for the bus and it's late, you could talk to the person next to you. But if you're texting to someone, you won't talk to that stranger,'' he says.