I believe they work exactly as normal memory cards. They respond to the ATR (Answer to Reset). Also their connection is the same as in the memory cards. So if you have managed to work with normal memory cards you will not have any difficulty. The only problem might be the connector. I used a plastic card from an older phone and stick the SIM with self adhesive tape.
Attached you will find a program in PBP i used to read from an old Tele-Card to open a door lock. I realy do not remember the connection but it is easy to figure. If I find them I will schetch and send.
Ioannis
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