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The first time it even sends a C-APDU, but no SW is returned. Also the data stream (ATR and APDU) look correct, so it does no seem to be a speed issue. I only had the card for 5 minutes and did not try to debug it more (check it the PPS fails, or something afterwards) or use an oscilloscope. But maybe someone might have an idea. Here the SIMtrace log: Entering main loop ATR APDU: 3b 9f 95 80 1f c7 80 31 a0 73 be 21 13 67 d0 02 04 09 01 00 00 05 PPS(Fi=9/Di=5) ATR APDU: 3b 9f 95 80 1f c7 80 31 a0 73 be 21 13 67 d0 02 04 09 01 00 00 05 PPS(Fi=9/Di=5) APDU: 00 a4 00 0c 02 fc 00 ATR APDU: 3b 9f 95 80 1f c7 80 31 a0 73 be 21 13 67 d0 02 04 09 01 00 00 05 PPS(Fi=9/Di=5) ATR APDU: 3b 9f 95 80 1f c7 80 31 a0 73 be 21 13 67 d0 02 04 09 01 00 00 05 And here the debug log: main(76): entering main (idle) loop VCC_PHONE off VCC_PHONE on RST computed Fi(1) Di(1) ratio: 372 found Fi=9 Di=5 computed Fi(9) Di(5) ratio: 32 nRST VCC_PHONE off VCC_PHONE on RST computed Fi(1) Di(1) ratio: 372 found Fi=9 Di=5 computed Fi(9) Di(5) ratio: 32 nRST VCC_PHONE off VCC_PHONE on RST computed Fi(1) Di(1) ratio: 372 found Fi=9 Di=5 computed Fi(9) Di(5) ratio: 32 nRST VCC_PHONE off VCC_PHONE on RST computed Fi(1) Di(1) ratio: 372 found Fi=9 Di=5 computed Fi(9) Di(5) ratio: 32 nRST VCC_PHONE off thank, kevin