New range of sleek and stylish smartphones from HTC Corp and Samsung empowered by Windows Phone 7.5, formally codenamed “Mango” available now.

“Windows Phone will help change the way people look at smartphones,” said Andy Lees, president of the Windows Phone Division at Microsoft Corp. “Other phones have you wade through a sea of apps, while we bubble up all the things that are important — centered around the people that matter to you most.”

To show case the Windows phone’s key features and experiences, Microsoft put real people inside a giant 6-story phone in New York City’s Herald Square.

Windows Phone is available from all major U.S. mobile operators, including AT&T, Sprint, T-Mobile USA and Verizon Wireless. In addition, the Windows Phone 7.5 software is available for every Windows Phone customer as a free software update.

While Microsoft amends the minimum hardware requirements for Windows Phone devices, Cameras are now optional. Probably Microsoft may bring cheaper devices, and the lack of cameras, to help new consumers enjoy Windows Phone experience at lower prices.