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T-Mobile and Nokia will debut the Lumia 710 next week, if a new report about an FCC filing proves correct.

The blog WPCentral reported Dec. 7 that T-Mobile had filed the manual and associated materials for the Nokia 710 with the Federal Communications Commission (FCC).

T-Mobile and Nokia have tried to maintain a veil of secrecy around their upcoming announcement, set for Dec. 14 in New York City. A joint invitation sent to media suggested something exciting in the works but was otherwise bereft of detail. Nonetheless, given how Nokia is solely in the Windows Phone business, it wouldn t take Sherlock Holmes to deduce that some sort of Windows Phone device was in the unveiling.

The bigger question was whether T-Mobile and Nokia would unveil the Lumia 710 or 800, or a new device altogether. The Lumia 710 is priced as more of a midmarket phone, while the Lumia 800 targets the higher end of the price range.  

Earlier this year, Nokia abandoned its homegrown operating systems, including Symbian, in favor of Windows Phone. Both the Lumia 710 and 800 run the latest variant of Microsoft’s smartphone platform. With that software in place, the Finnish phone-maker hopes to retain its global presence in the face of fierce competition from both Apple’s iPhone and Google Android devices.

But both Nokia and Windows Phone have an uphill battle for a substantial piece of the U.S. smartphone market. Microsoft owned 7.3 percent of the U.S. smartphone market in the third quarter, according to new data from Nielsen. That number includes both Windows Phone and the older, largely discontinued Windows Mobile. Moreover, that number trails Research In Motion’s BlackBerry at 17.8 percent, Apple’s iPhone at 28.3 percent, and Google Android at 42.8 percent.

Earlier this year, the firm placed Microsoft’s share of the market at 9 percent, trailing Android at 39 percent, Apple’s iPhone at 28 percent, and RIM’s BlackBerry at 20 percent. Microsoft routinely refuses to release any hard data relating to smartphone sales, leaving it up to third parties like Nielsen to offer their own numbers–and even then, the continuing presence of Windows Mobile clouds the ability to tally Windows Phone. 

To read the original eWeek article, click here: T-Mobile’s Nokia Windows Phone Will Be Lumia 710: Report