I have recently purchased an HTC Salsa for my wife from O2. The specs say that it can make "Video Calls" however I have spoken to HTC and it cannot make standard "video calls" as defined by the UK networks. Many other phones including my own Nokia N8 can! To use the front facing camera to make video calls (ie internet video chats) you have to install Fring or Tango or one of the other video chat apps. As Tango does not work on Nokia phones I have installed Fring which works ok (note that you have to enable video calls in the Fring settings for it to work).
I have complained to HTC and O2 that their adds are misleading as the Salsa can not be used to make standard network video calls.