A method and an apparatus for operating a timer in an integrated circuit (IC) are disclosed herein. The IC includes a timer, a receiver configured to receive a circuit switched (CS) service notification, a transmitter configured to transmit an evolved packet system mobility management extended service request (ESR) message, and a processor configured to start the timer in response to transmitting the ESR and stop the timer in response to reception of a handover command and completion of a CS fallback procedure by the receiver, wherein the handover command directs the IC to handover to another radio access technology (RAT) so that a CS call may be established. The processor may be configured to stop the timer in response to reception of a cell change command and completion of a CS fallback procedure by the receiver, wherein the cell change command directs the IC to perform a cell change procedure.