It support WIFI means that you can use it to surf the internet in a high speed with the internet browser. Plus there's the important function of quadband (GSM 850/ 900 / 1800 / 1900 MHz), which is ensuring you can be in touch wherever you go. While triband phones will work almost everywhere in the world there are a small number of locations where you'll need a Quad Band to ensure complete coverage. The HTC S1 also offers windows live, MSN / mobile QQ commuication at real time. 2.0MP high-definition camera, MP3 / MP4 professional player, PC synchronization via bluetooth or USB are all available. Plus, there's also built-in Java Midp 2.0 can be downloaded thousands of entertaining games, which will bring you into the funny game's world.