Generic SIM access +CSIM

The +CSIM command transmits a command to the Subscriber Identity Module (SIM).v1.0.xv1.1.xv1.2.xv1.3.x

For reference, see 3GPP 27.007 Ch. 8.17 and ETSI TS 102 221 Ch. 10 and 11.

To avoid conflicts with modem firmware, +CSIM is limited so that only the following commands are allowed on a basic channel (channel 0 encoded in CLA):

• STATUS, with P1=”No indication”
• MANAGE CHANNEL, open/close logical channels
• PIN-code-related commands (VERIFY, UNBLOCK, ENABLE, DISABLE, CHANGE)
• ENVELOPE, send application toolkit-specific information to Universal Integrated Circuit Card (UICC)

To use other commands, use MANAGE CHANNEL to open a logical channel, encode the channel number in the CLA byte of the subsequent commands, and close the logical channel when SIM card access is finished.