Nokia's decision to adopt Microsoft's Windows Phone platform for its smartphones is showing the first signs of paying off. Bloomberg polled some 22 anaylsts and asked how many Lumia smartphones they believe Nokia has sold to-date. The answers ranged between 800,000 and 2 million.

According to Bloomberg, the average prediction by analysts of the number of Lumia smartphones believed to be sold so far is 1.3 million. Only one of the 22 analysts polled believed Nokia has sold fewer than 1 million of the WP7 Mango smartphones.

"The numbers look promising," Espen Furnes, an Oslo- based fund manager at Storebrand Asset Management, told Bloomberg. "If Nokia is able to have a strong launch and surpass at least 1 million and keep that type of momentum, this would help put them in a credible position that is crucial to winning back investors."

Nokia has to win back customers, first. Former Symbian smartphone owners spent 2010 and 2011 fleeing devices made by Nokia in favor or those made by Apple, LG, HTC, Motorola, Samsung, Sony Ericsson, and others. The rise of Google's Android platform has meant the demise of Nokia's legacy platform. Nokia announced the switch to Microsoft's Windows Phone in February 2011, and the Lumia devices are the first wave of such smartphones to reach the market.

The Lumia 800 and Lumia 710 were announced in October. The 800 went on sale in European markets in November and have so far enjoyed decent sales.

The 710 went on sale in the U.S. on January 11, Nokia's first smartphone to be sold by a major U.S. network operator in years. It is a $49 device that can be picked up for free if you know where to look. It's a mid-range device.

At CES 2012, Nokia announced the Lumia 900. The Lumia 900's stand-out feature is support for AT&T's LTE 4G network--it is one of the first Windows Phone device to support a 4G networking technology. The Lumia 900 includes a 4.3-inch AMOLED ClearBlack display, a 1830 mAh battery, 1.4-GHz dual-core processor, 8-megapixel main camera, and a front-facing camera for video chats. The Lumia 900s design is similar to that of the N9 and the Lumia 800, and is milled from solid block of polycarbonate. The Lumia 900 will be an exclusive device for AT&T. Pricing and availability were not revealed.

These three devices are a solid first step in the world of Windows Phone and broader smartphone market. The Lumia 800 and 710 appear to have captured the hearts of early buyers. Whether or not the Lumia 900 and subsequent devices can maintain that momentum will be Nokia's real challenge.

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