But if you don't have a PDA, accessing and sending e-mail using a cellphone is still a major hassle.

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It was not clear what the detonation device was, but the charges against Dzhokhar say he was using a cellphone moments before the blasts.

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Even simply using a cellphone was banned at the concert thrown by phone-maker Samsung, though promoters worked the crowd beforehand, offering customers fresh phone batteries or device test-drives.

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"It's relatively easy to spot a driver using a cellphone, but it's very tough to figure out whether someone is making improper eye contact with the dashboard, " said Koshiro Sawaguchi, of the Tokushima Police Department.

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Mr. Davis was arrested after detectives tracked him down using images captured by cellphone video shot by a witness, showing the tense moments before the deadly push.

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In an application with the U.S. Patent Office published in December 2007, Apple described a wireless system that would allow customers to place an order at a store using a wireless device such as a media player, a wireless personal digital assistant or a cellphone.

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Although police will not disclose the contents of the notes she has passed to tellers, we can infer that the Cellphone Bandit started out using the threat of a bomb or gun and then escalated to brandishing an actual firearm.

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