A non-intrusive cellular phone app eliminates a need for the driver to respond to a received text message while driving. The app does not interfere with the normal functioning of the cellular phone. The app sends an immediate response text message to a sender of a received text message that the owner of the cellular phone is driving and can't text. The app notifies the driver of the identity of the sender only by any of a variety of means, most of which do not require the attention or the action of the driver. Action by the driver may be taken later under safe conditions using the normal functioning of the cellular phone.