Microsoft’s rebirth as a mobile phone player in the US market begins on Monday with the retail availability of five Windows Phone 7 devices, making for a global total of ten first-wave smartphones on the new platform. Starting Monday we’ll see the first of three WP7 phones on AT&T and two more on T-Mobile. A single CDMA device has also been unveiled for Sprint, with announced availability in early 2011. Verizon, for what it’s worth, has publicly stated they don’t plan to carry any WP7 phones, though that may or may not pan out.
Early reviews of the HTC 7 Surround and Samsung Focus for AT&T and HTC HD7 for T-Mobile - along with the first WP7 phones launched in Europe - have already hit online and print outlets. Dell’s Venue Pro is said to be coming to T-Mobile in time for Christmas and that Sprint phone, HTC’s 7 Pro, may go up for pre-order in early December with an early 2011 ship date, but we don’t yet have solid launch information on either device.

Hit the jump for more information and detailed spec sheets!