The information age requires information to be retrieved and inputted anywhere and anytime. This made the text input capability (similar to the functionality of computer keyboard) become more and more important. However, electronics devices have been getting smaller and smaller, the challenge is to made the functionality of keyboard in very small space and in user-friendly way. We can see that the biggest barrier preventing mobile phone from being used as editor and address book is the troublesome alphabet input and limited characters. Therefore, the text input interface have become a critical factor for the functionality and design of electronic devices such as mobile phone, PDA (Personal Digital Assistant), Digital Camera, Music Player, Portable Media Player (PMP) and game console. It also needs to have a balance between size and usability, with consideration of learning curve and computation overhead involved.