Patent ID: 7802307

Claim:
A method of preventing unauthorized communications, the method comprising: communicating, from a mobile unit to a base station, a static mobile unit identifier that uniquely identifies the mobile unit and a random identification number; comparing, at the base station, the random identification number and a stored random identification number, whereby the authorization of the mobile unit is determined by the base station, thereby providing security; completing a call to or from the mobile unit upon authorization; and ending the call to or from the mobile unit, updating the random identification number at the mobile unit based upon the stored random identification number at the base station, wherein the base station receives the stored random identification number from a central control, the central control generating a random identification number table associated with the static mobile unit identification number and communicating a generated random identification number to the base station, and wherein the random identification number is updateable, and is updated with each call based on the static mobile unit identifier, at a periodic time interval, and/or upon an occurrence of a triggering event.