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BARCELONA -- The Ace, available from the Filipino carrier Cherry Mobile, costs just $23 (that's around £15 or AU$30). It runs Firefox OS, Mozilla's browser-based operating system. It's powered by a 1GHz ARM processor made by Chinese chipmaker Spreadtrum.

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Photo by: Stephen Shankland/CNET

The Cherry Mobile Ace runs Firefox OS, which Mozilla hopes will spread its ethos of openness and help bring Net access to people who can't afford it today.

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Photo by: Stephen Shankland/CNET

The Cherry Mobile Ace's plastic housing has rounded corners and a stippled back. On the back is a 2-megapixel camera.

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Photo by: Stephen Shankland/CNET

The 3.5-inch 480x320-pixel screen is small and pixelated compared to today's high-end phones -- but remember that this phone costs as much as a lunch for two at a sandwich shop.

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Photo by: Stephen Shankland/CNET

The Cherry Mobile Ace has a USB charging port on one side. It's a dual-SIM design, which is popular in developing countries where customers often subscribe to different carriers' network service for better coverage.

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Photo by: Stephen Shankland/CNET

The Firefox OS browser-based app is most comfortable with Web apps like this one from Wikipedia. In principle, any mobile-optimized site will work fine as an app on Firefox OS.

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Photo by: Stephen Shankland/CNET

On the top of the Cherry Mobile Ace is a 3.5mm headphone jack.

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Photo by: Stephen Shankland/CNET

To switch between tasks, a long press on the home button calls up active apps.

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Photo by: Stephen Shankland/CNET

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