According to prosecutors, use of the stingray was authorized under a court order that investigators used to procure real-time tracking information from Verizon Wireless, Rigmaiden's service provider.

ENGADGET: DoJ: Stingray cellphone tracking device falls under Fourth Amendment, but don't ask about it

And until last week, Nextel was the only wireless service provider in the U.S. offering the service.

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Amp'd Mobile is painting itself as the first wireless service provider to target young adults--and it's developing a sort of "CrackBerry" for kids, a cell phone-like device with a screen to provide all of their mobile entertainment needs.

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