The Register Hardware have published a review of the HTC Touch HD Windows Mobile smartphone. 'At the bottom of the phone is a single USB 2.0 port, and on top is the large start/stop button and a 3.5mm socket for headphones. The rubber-plastic back would be more effective in preventing it slipping around when placed on a table except that the phone actually rests on the protruding glossy plastic boss at one end and the metallic surround of the camera lens at the other. Below the screen are four buttons that are touch-sensitive and flush with the face. They're for call start and end, home and back. Each pulses gently with haptic feedback when you press them.'