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A Windows Phone 7 debut on AT&T is not that surprising, since Microsoft in February anointed the carrier as its premier Windows Phone 7 partner in the U.S. It is, however, a strange decision considering that AT&T is the exclusive home of Apple's iPhone, and it may be difficult for Microsoft's devices to compete with the wildly popular iPhone so directly. AT&T 's reputation as a reliable carrier has also suffered in recent years since the introduction of the iPhone.Nevertheless, AT&T has been steadily improving its network over the last year and recently took top honors in PC World's most recent 3G network speed tests. AT&T is also the largest GSM carrier in the U.S.
The Journal says AT&T will sell three Windows Phone 7 handsets at launch, offering one device each from Samsung, LG Electronics, and HTC. It's not clear what those handsets might be, but a rumored HTC device code-named Mondrian is a heavy favorite. The Mondrian is rumored to be similar to HTC's Windows Mobile-based HD2. The device reportedly has a 4.3-inch WVGA screen and a 1.3GHz Snapdragon processor, according to Engadget.