To activate Return Call dial *69, and listen for a recording of the number of your last incoming phone call. To call that number, dial '1' (see note below). If the number is busy, hang up. Within 30 minutes, during which you can still make and receive calls, a distinctive ring will signal when the number is available. If the 30 minutes pass without the distinctive ring, Return Call is deactivated. To deactivate Return Call, dial *89.