Patent ID: 7496381
Filing Date: 2009-02-24
Classification: H04L,H04W

Abstract:
1. A method of preventing unauthorized use of a removable user identification module (UIM), the method comprising: attaching a removable UIM previously used with a first communication terminal to a second communication terminal, wherein the UIM has first and second card holder verification (CHV) states; and determining whether the second communication terminal is attached to the UIM for a first time when the second communication terminal is powered on; and changing the CHV state to require user authentication of the UIM if the second communication terminal is attached to the UIM for the first time, wherein determining whether the second communication terminal is attached to the UIM for the first time comprises: the UIM examining an electronic serial number (ESN) of the second communication terminal when the UIM is attached to the second communication terminal; comparing the ESN of the second communication terminal with a stored ESN in the UIM; and determining that the second communication terminal is attached to the UIM for the first time if the ESN of the second communication terminal does not match the stored ESN in the UIM.