Myers, camera phone in hand, walked up to strangers and asked them to name their favorite place nearby and give directions.

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It has an infra-red sensor that looks for hand movements up to about 4 inches away from the phone, and it uses the front-side camera to figure out if it's front of the user's face.

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Consisting of a trio of grip sensors located along the two edges and across the back of the prototype phone, these can each detect up to five levels of pressure from your hand, as well as detecting how you're holding the device.

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If you get through the meeting or phone call and the prospect leaves you hopeful, send a follow-up e-mail or hand-written note immediately.

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"Victims now are far less likely to be a bashed-up pensioner and more likely to be a young professional who has had a phone grabbed out of their hand or pocket, " he said.

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