Motorola g20 Developer's Manual page 18

Product Features
2.1.1.3.2 Proactive SIM
Proactive SIM service provides a mechanism for the SIM to initiate actions to be taken by the g20. The SIM can inform the g20
that it has information to transmit to it. The SIM can issue a variety of commands through this mechanism, including the
following:
• Displaying text
• Sending a short message
• Setting up a voice call to a number held by the SIM
• Setting up a data call to a number whose bearer capabilities are held by the SIM
• Sending an SS control or USSD string
• Playing a tone
• Initiating a dialogue with the user (get inkey, get input)
• Requesting SIM initialization and notifying about changes to EF(s) (refresh)
• Providing local information from the g20 to the SIM
2.1.1.3.3 Data Download to SIM
Data downloading to the SIM uses short message service (SMS), point-to-point (PTP) and cell broadcast transport mechanisms.
Transfer of information over the SIM-g20 interface uses the ENVELOPE command.
2.1.1.3.4 Menu Selection
The SIM supplies a set of possible menu entries via a proactive SIM command. The menu selection mechanism is used to
transfer the SIM application menu item selected by the user to the SIM.
2.1.1.3.5 Call Control by SIM
When this service is activated by the SIM, all dialed digit strings, supplementary service control strings and USSD strings are
first passed to the SIM before the g20 sets up the call, the supplementary service operation or the USSD operation. The SIM has
the ability to allow, bar or modify the call, the supplementary service operation or the USSD operation. The SIM also has the
ability to replace a call request, a supplementary service operation or a USSD operation with another call request or
supplementary service operation or USSD operation. For example, a call request can be replaced by a supplementary service
operation or a USSD operation, and vice-versa.
2.1.1.3.6 Security
Applications designed using the features in this specification may require the use of methods to ensure data confidentiality, data
integrity, and data sender validation, or any subset of these.
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