Abstract: A device for dialing a preprogrammed telephone number is inserted between a cord connecting the handset and body of a telephone set and either the handset or the body. In order to provide an incentive for installing the device, it is preferably incorporated in a cord detangler having a jack for receiving one end of the cord and a relatively rotatable plug for insertion in a jack in the handset or body. A push button switch on the device activates the redial function of a DTMF tone generator chip which is connected electrically in parallel with the microphone conductor pair of the cord connection. A nonvolatile redial memory is provided, either by providing battery backup for the chip so as to retain a preprogrammed number in memory even when polarization current is not available to power the chip, or by providing a read-only redial memory.