Abstract: A mobile phone device allows modification of utilization functions through selective assembling performed by a user. The mobile phone device includes a mobile phone and at least one keyboard. The mobile phone and the keyboard can be selectively assembled together to allow for operation of the mobile phone with the keyboard or separated from each other to allow the mobile phone to be operated in the same way as it was. The keyboard is provided with at least one pushbutton/key arrangement to allow for selection and use of the keyboard according to a desired operation so that versatility and use of the mobile phone can be realized.

Abstract: A system and device enabling PC-specific online games on mobile phone, which applies a format selection system to convert the PC-specific game software and relevant data into the format compatible with the mobile phone; then, the mobile phone can be linked to the game servo center using existing wireless telecom system, and permit the users to select PC or mobile phone to enjoy the same online game with the format selection function.