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AT&T is the premier Windows Phone partner in the U.S. and in addition to the new Nokia Lumia 900 they launched the HTC Titan II. After testing out both of the devices, I have to say I like the HTC Titan II better than the Lumia 900.
Check out my ZDNet Smartphones and Cell Phone blog post for more details on the HTC Titan II.
Here you can see three generations of HTC Windows Phone devices with the HTC HD7, HTC Radar 4G, and HTC Titan II.