Mobile networks have become a very attractive channel for the provision of electronic services, as they are available almost anytime and any-where. But for a service provider, there are several mobile communication standards to choose from. They differ in market penetration, flexibility, and security. This paper gives a comparative overview of the security features of GSM, SIM Application Toolkit and WAP (Wireless Application Protocol). It describes the trust relations involved, and gives examples of typical applications suitable for each of these standards.
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