Patent ID: 7702367

Claim:
A mobile telecommunication handset comprising: a display unit; a keypad having at least one abbreviation key for switching from one display screen to another display screen on the display unit in a single step; a storage unit configured to store at least one message; and a control unit configured to temporarily store a message being composed in the storage unit and switch a display screen on the display unit in the single step when an input is received via the at least one abbreviation key, wherein upon receiving the input via the at least one abbreviation key, the control unit is further configured to: switch a message composing screen that displays the message being composed to a screen for displaying contents of a newly received message when the contents of the newly received message have not been checked yet; switch the message composing screen to a screen for displaying a list of previously received messages when no new message has been received; determine whether a temporarily stored message is present in the storage unit when the at least one abbreviation key is selected while displaying the screen for the list of the previously received messages or the screen for the contents of the newly received message; retrieve the temporarily stored message from the storage unit and display the message composing screen comprising the retrieved message that has been composed on the display unit upon determining presence of the temporarily stored message in the storage unit; and display the message composing screen for composing a new message upon determining that no message is temporarily stored in the storage unit.