Unity supports the conventional types of input device used with games (keyboard, joypad, etc) but also the touchscreens and movement-sensing capabilities of mobile devices. These types of input are covered in this section.
Additionally, Unity can make use of a computer’s microphone and webcam to input audio and video data. See the Audio and Graphics sections of the manual for further information.
Is something described here not working as you expect it to? It might be a Known Issue. Please check with the Issue Tracker at issuetracker.unity3d.com.