There are a number of credit card processing apps for mobile phones, but they require you to punch in account numbers by hand. The marketplace, a new iPhone case by mophie, has a built-in magnetic-strip reader that lets you collect credit card information with one swipe, then process the payment using a third-party merchant account. The rubberized 2-ounce case encrypts data on the reader even before it reaches the phone. It also has a USB port for syncing and charging.

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