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The company on the same date will start selling the HTC Titan II, priced at $199.99. It has a bigger screen than the Lumia 900 - 4.7 inches vs. 4.3; and a higher resolution camera - 16 MP vs 8 MP.
The two models are the first Windows 7-based phones that will run on AT&T's LTE network.
The Lumia phone can be pre-ordered with Cyan or Black cases starting March 30; a glossy white version will be available April 22.
Here's a little AT&T video on the Lumia 900, in case you haven't seen the phone previously.