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Smart phones can provide music, movie times, bus schedules.

The lab, though it may seem quiet and insulated, can be as full of background noise as a crowded train station when we're trying to catch the announcements. Our brains can filter out the noise and focus on the message up to a certain point, but turning up the volume on the loudspeakers – improving the signal-to-noise ratio – helps as well.

By using the host of position-relating sensors in modern smartphones, scientists at MIT think they could make the phones and network perform better so your calls don't drop when you're on the move. When you're strolling or rolling through a crowded city chatting on your cellphone, there are a number of things that can get in the way of your call working properly. A primary culprit is handoff between different cell towers.