METHOD AND SYSTEM FOR UPDATING AN ISDN NUMBER AND AN IDENTITY CODE IN A CELLULAR DIGITAL MOBILE TELEPHONE SYSTEM

摘要

The present invention relates to a method of updating a first identity code and a first ISDN number in a cellular digital mobile telephone system including at least some mobile transceivers fitted with fixed SIMs having recorded thereon a first identity code and a first ISDN number relating to an initial mobile telephone operator. The invention is characterized by delivering a second identity code relating to at least an additional mobile telephone operator over an air interface to said given SIM and connecting the second identity code to a second ISDN number at the same time as the first identity code is deactivated, such that no more than one identity code and ISDN number are active on said SIM at any given time. By means of the invention, an improved and mode effective process for manufacturing vehicles can be accomplished.