On a mobile telecommunications device, computer-executable code executes to facilitate interactions between the user of the mobile telecommunications device and a call center or other computer-telephony integration equipment. The computer-executable code includes instructions that request at least one operation to be performed at a call center, where the call center includes a call center controller, an interactive voice response system component, and at least one agent. At least in part, a wireless network transmits the request from the mobile telecommunications device to the call center controller.