In comparison, the 8S has a 5MP rear cam capable of 720p recording and a front cam for video conferencing.
"Pairing HTC's beautiful new Windows Phone 8X and 8S with our brand is a big milestone for both companies," said Steve Ballmer, CEO of Microsoft.
"Together we are offering customers a clear choice and a truly unique experience. I'm thrilled to take our longstanding partnership to the next level."
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HTC says it has been "inspired by Windows Phone 8 to create new smartphones that give the platform the iconic design and personality it deserves," said Peter Chou, CEO.