Abstract: A cell phone which has been modified by the addition of software which responds to the press of one or more Busy keys by automatically sending a pre-typed text message to the sender of the latest text message just received or automatically answering an incoming call immediately upon pressing the Busy key and playing a pre-recorded audio message. The outgoing text or audio message can inform the sender of the incoming text or the caller that the user is driving or otherwise engaged and cannot respond immediately. In some embodiments, one or more Busy keys can be added keys or one or more existing keys on the cell phone or on the keypad of the cell phone or on a touchscreen or a visual depiction of a keypad on a touchscreen of the cell phone. In some embodiments, only the text of the automated reply message is entered automatically, and all other commands to launch the SMS service, select the text message to reply to and send the automated reply message are manually given.