AT&T Mobility and Microsoft have launched two new devices, the Nokia Lumia 900 and the HTC Titan II, the first Windows Phones available on the mobile operator’s 4G long-term evolution (LTE) network.

Nokia Lumia 900 comes with a 4.3-inch ClearBlack display with a 480 x 800 resolution, an 8-megapixel rear camera with Carl Zeiss wide-angle lens and 720P recording, 1-megapixel front facing camera, 512 MB of RAM, 1.4 GHz Qualcomm Snapdragon processor, 16 GB non-expandable storage offering both 3G and LTE connectivity.

The Nokia Lumia 900 is available in a cyan blue, matte black, and a white version coming shoortly, which will go on sale April 22 for US$99.99 with the activation of a two-year service contract.

The HTC Titan II, the next-generation Titan device will be available for $199.99 with a two-year service contract.

The device features a 16-megapixel camera, a dedicated image processor and a back-illuminated sensor for low lighting with a 4.7-inch display, the largest among Windows Phones, and a 1.5 GHz Snapdragon S2 processor.

The 4G LTE network is a wireless mobile radio technology designed to succeed current wireless technology including 3G and the like.