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T-Mobile USA and Hewlett-Packard Co. next month will introduce the first-ever handheld computer that also works as a cell phone and can tap into the Internet using high-speed wireless hotspots, the companies said on Monday.

As well as carrying phone calls the device, only available from T-Mobile USA, also has links for Wi-Fi and Bluetooth, another short-range wireless standard used to connect items such as handsets and headphones. It goes on sale in August, the companies said, and will cost $499. 'This is the first device that pools everything together,' said T-Mobile USA vice president for business services Scott Ballantyne, who added the gadget would come with T-Mobile's first subscription plan combining cellular and Wi-Fi services.