A method for saving number applied to a handheld electronic device is provided. In the method, in response to determining that the total number of digits of a entered number reaches the predetermined minimum number and the entered number does not correspond to a part of any one of one or more contact data, a save button is displayed on the screen for saving the entered number after the save button is triggered, a save button is shown on the screen, and the entered number is saved after the save button is triggered.