1. A cell phone designed to operate in a normal mode and a driver mode, in the normal mode, a driver mode reply message is not automatically sent to a message sender responsive to incoming text-based messages and, in the driver mode, the driver mode reply message is automatically sent to the message sender responsive to the incoming text-based messages, the phone comprising: a memory adapted to maintain the driver mode reply message; a text-based message system adapted to receive the incoming text-based messages and send outgoing text-based messages; a screen adapted to display the incoming and outgoing text-based messages; a text entry interface adapted to receive user input of the outgoing text-based messages; at least one processor coupled to the memory and the screen; and a driver mode system adapted to transition the phone between the normal mode and the driver mode; wherein, the device is operable to transition between the normal mode and the driver mode responsive to user input; wherein, responsive to incoming text-based messages from message senders when the device is in the normal mode, the text-based message system does not automatically send the driver mode reply message to the message senders; wherein, responsive to a first incoming text-based message from a message sender during a driver mode session, the text-based message system automatically sends the driver mode reply message to the message sender; and wherein, responsive to subsequent incoming text-based messages from the message sender during the driver mode session, the text-based message system does not resend the driver mode reply message to the message sender.