High Quality Content by WIKIPEDIA articles! The HTC One X is a touchscreen-based, slate-sized smartphone designed and manufactured by HTC. It runs the Android 4.1.1 mobile operating system with the HTC Sense 4+ graphical user interface. By date, it was the first HTC phone to be equipped with a quad-core processor and made it the fastest HTC phone to date. The One X was announced on February 26, 2012 at the Mobile World Congress, and considered as a flagship product of HTC One series.