Motorola G24 用户手册

The proactive SIM mechanism enables the SIM to initiate actions to be handled by the G24. 
Using this service, the SIM can inform the G24 that it has information pending for action. The 
SIM can issue a variety of protocol commands through this mechanism, for example:

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)

Providing local information from the G24 to the SIM

Profile download

Send DTMF

Set up idle text mode

Launch browser

Set up event list

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 and then via SMS to the provider.

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 G24 sets up the call, the 
supplementary service operation or the USSD operation. The SIM has the ability to allow, disable 
or modify the call. The STK has the ability to replace a call request, a supplementary service 
operation or a USSD operation with another call, for example, a call request by the G24 can be 
diverted to a different destination.