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Abstract — Easy and secure access is of key importance in acceptance of new mobile services. This paper extends the possible use of the SIM as authenticator in the online world. The paper proposes Near Field Communication (NFC) technology as a transfer technology between the mobile handset and other devices. A possible architecture is shown, future SIM requirements and secure key transfer are addressed. Final focus is on handset-internal communication, with emphasis on requirements and constraints raised towards the internal architecture