mobile.Application.Development.with.SMS.and.the.SIM.Toolkit

The success story of GSM is also the success story of the SIM. Every subscriber needs a SIM and there is no service without it. This is unlike some other systems where the micro-computer in the smart card offers just an additional service which may or may not be used by the customer. With more than 600 million subscribers worldwide, GSM is by far the largest application employing smart cards and it has taken the smart card industry from its infancy to adulthood. GSM is closely linked with the introduction of mass production of smart cards and the ever increasing requirements of the SIM have given a huge impetus not only to the technological advancement of the microcomputer itself, be it the memory provided by today’s chips or their electrical parameters, but also to the development of operating systems, application provision and programming interfaces of smart cards in general.