Patent ID: 7206590

Claim:
A method for setting a correct time, the method comprising: in response to a clock set trigger, attaching a status report request to an SMS message; transmitting the SMS message to initiate the transmission of the status report; requesting a status report; storing a first device time corresponding to requesting the status report; receiving the status report; storing a second device time corresponding to receiving the status report; setting a device time error equal to a time difference between the second device time and the first device time; determining a world time from the status report; and setting a current device time in accordance with the world time; wherein the step of setting a current device time in accordance with the world time comprises the steps of: calculating a device time difference between the world time and a current device time; setting a corrected time equal to the sum of the device time difference and the current device time; and setting the current device time equal to the corrected time, wherein the device time error represents an accuracy of the corrected time.