No. 4 wireless carrier T-Mobile will be exclusively launching Nokia's (NYSE:NOK) Lumia 521 phone starting in May, the company announced today.

The carrier had said in February that it would offer the device without detailing a specific time frame. The Lumia 521 is positioned as an affordable device. However, T-Mobile did not provide specific pricing details or a specific date in May for launch.

The Lumia 521 willl feature a 4-inch display and 5-megapixel camera, and offer several of Nokia's first-party services such as Nokia Music. The device will be powered by Microsoft (NASDAQ:MSFT) Windows Phone 8. T-Mobile plans to distribute the Lumia 521 through its retail stores, as well as Wal-Mart and Microsoft retail locations.

T-Mobile currently offers only two Windows Phone devices, the HTC 8X and Lumia 810.

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