Detachable back mounted touchpad for a handheld computerized device

A method of operating a non-transparent handheld computerized device, said method comprising:

• providing a detachable touchpad device having an opening adapted to reversibly receive the non-transparent handheld computerized device, said detachable touchpad device comprising:
• at least one section comprising a rigid non-foldable cover including a front side adapted to form a contact with a back side of said non-transparent handheld computerized device when said non-transparent handheld computerized device is inserted in said detachable touchpad device via said opening;
• at least one touch sensing pad disposed on a back side of said at least one rigid non-foldable cover of said detachable touchpad device, said at least one touch sensing pad adapted to detect a touch input from a user when said user holds said detachable touchpad device thereby enabling the user to control said non-transparent handheld computerized device using said detachable touchpad device, wherein said at least one touchpad is free from mechanically actuated keys;
• and
• a data transfer device in said detachable touchpad device comprising interface circuitry adapted to transfer data representative of said touch input from said detachable touchpad device to at least one processor of said non-transparent handheld computerized device, said processor being adapted to detect and interpret said touch input to control said non-transparent handheld computerized device when said data is transferred.