No. 4 wireless carrier T-Mobile will be exclusively launching Nokia's (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 (MSFT -0.66%) 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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