Photos/Price/Features: Kyocera Echo: The dual-screen smartphone

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Like many other smart phones, the Echo runs Google Inc.'s Android software.

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Adding an extra screen is Sprint's way of making the phone stand out from dozens of others that also run Android.

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For now, Sprint has re-configured the basic e-mail, text messaging, photo, video and Web browser features, along with some games, so that you can use these apps while doing different things on each screen. That list will grow to include more specific Android apps, Sprint said.

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One question that remains about the Echo is how long it's likely to last on a charge. For now, Sprint says the phone can offer at least 5.5 hours of talk time, though the company might succeed in stretching the battery life by the time it goes on sale. The iPhone, in contrast, claims 7 hours of talk time.

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Perhaps to pre-empt any complaints about its endurance, Sprint will include a spare battery in the box, along with a device that can recharge both the phone and the second battery at the same time.