Karbonn has launched first Windows based phone, Karbonn Titanium Wind W4! Karbonn Titanium Wind W4 supports Windows Phone 8.1 operating system and is available for Rs 5,999 exclusively on Amazon India’s website. ITVoice News: Karbonn has launched its first Windows based phone, Karbonn September 27, 2014 News/Phone Reviews/Product Launch/Technology News