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Tom Schouten tom at zwizwa.beHi List, When using MITM it is possible to set the SIMtrace<->phone voltage levels using ATR, giving a clear-cut way to solve the incorrect I/O level problem: See byte TA(3) C7->C2 orig ATR from card: http://smartcard-atr.appspot.com/parse?ATR=3B9F95801FC78031E073FE2113574A330530323402A3 modded to select only 3V: http://smartcard-atr.appspot.com/parse?ATR=3B9F95801FC28031E073FE2113574A330530323402A6 Cheers, Tom