Recording videos in slow motion Relive high speed action bit by bit and add a touch of suspense to your videos.
Extreme power saving mode In times when you don't need to use much of your phone, turn Extreme power saving mode on to ...
Android 6.0 Marshmallow Android™ 6.0 Marshmallow brings new features that make your mobile life more convenient.
Touch gestures Use touch gestures to get around the Home screen, open apps, scroll through lists, and more. ...
Changing the display font You can change the font style and size of the display font or you can download new fonts online....
Using HTC BoomSound with headphones Plug in your headphones and turn on HTC BoomSound with Dolby Audio to enjoy refined audio...
HTC BoomSound Connect app If you're using Qualcomm AllPlay powered speakers, download and install the HTC BoomSound ...
Restarting HTC One M9 (Soft reset) If HTC One M9 does not respond when you touch the screen or press the buttons, you can still...