This subforum is for the t-mobile HTC One original. If it is, can you tell me what app you are using for the double tap of the screen because I thought the original HTC One didn't have it in the hardware.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?