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Used Cellphones Hold Trove of Secrets That Can Be Hard to Erase

Sam Bachman is a frequent upgrader. Not of cars or homes, but of his "smart phone." Hooked on the convenience of a cellphone that's also a mini PC, calendar and address book, the Virginia social worker just bought his sixth Treo smart phone. And before advertising his old model for sale online, he...
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By Ellen Nakashima