C123: reading SIM stuck

Hi, just for curiosity, I would like to get the osmocomBB running on the Motorola C123. Everything works fine (radio starts scanning for networks) if I use the test SIM feature. But reading a real SIM plugged into the phone does not work for me. The 'mobile' app shows: <0004> subscriber.c:556 Requesting SIM file 0x2fe2 <000e> sim.c:209 got new job: SIM_JOB_READ_BINARY (handle=00000004) <000e> sim.c:697 go MF <000e> sim.c:241 SELECT (file=0x3f00) <000e> sim.c:187 sending APDU (class 0xa0, ins 0xa4) -end- Any hints where to start debugging? (does neither work with 3 different SIMs: swisscom, blau, super-sim) BTW: Are there any plans to support external SIM readers via PC/SC etc.? Thanks Frank