From a poll, the RIM BlackBerry Tour (9630) was the most popular.
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Totipotent
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diagram
How is a cell phone useful in everday life
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why are cell phones useful to home schooled kids
yes
Wireless headsets are most useful for using a cell phone safely and legally while driving. They are also handy to have when you're trying to multi-task and need both hands free.
Most useful and more useful.
more useful, the most useful