The invention is a method of creating a dialstring for use with mobile smartphones and other computer-enabled telephones. A software app designed to implement the method recognizes input from the user (such as the initial digits of a phone number) that identifies the organization to be called, and accesses a stored representation of the IVR phone tree for that organization. The app then presents a graphical representation of all or part of the phone tree on the display of the telephone. The user can then respond to the graphical representation by providing selective inputs that cause the app to synthesize all or part of the dialstring needed to navigate the phone tree to the desired destination. Once a dialing option has been synthesized to the user's satisfaction, the user may provide additional input that the system interprets as an instruction to open a phone call and dial the synthesized number.