I'm trying to get my SmartCard reader to communicate with my phone's SIM card. I have a level shifter to drive 1.8V and 3.0V SIM cards, but the Wikipedia article specifies that there are also 5.0V SIM card. I just want to be sure that my SIM card is not a 5.0V one.
How can I determine the operating voltage of my SIM card? (I have access to a scope, and my SIM card is a Tesco Mobile one produced by Gemplus.)