The CTIA Wireless tradeshow is going on now in Orlando, and HP using taking the opportunity to show off the iPAQ 510 Voice Messenger, the device that will be this company’s first smartphone running Windows Mobile 6.

Not part of the demonstration, though, is any word on when this device will hit the market, or what carriers will be offering it.

The reason for this is HP might still be be working on this iPAQ. In past few months, its screen resolution has changed from 176 by 220 pixels to 240 by 320 pixels.

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