Hi, if it gets detected you should use the right option of pysim to interact with a tty based reader instead of the pcscd based reader. from the help output (pysim-read.ph -h): Serial Reader: -d DEV, --device DEV Serial Device for SIM access (default: /dev/ttyUSB0) -b BAUD, --baud BAUD Baud rate used for SIM access (default: 9600) PC/SC Reader: -p PCSC, --pcsc-device PCSC PC/SC reader number to use for SIM access (default: None) Cheers Bjoern ________________________________ Von: bhogendra.rao@gmail.com <bhogendra.rao@gmail.com> Gesendet: Freitag, 10. Februar 2023 12:20:23 An: openbsc@lists.osmocom.org Betreff: Re: Card initialization failed with exception Thank you for your query. I could see in the dmesg output that the device is mounted at /dev/ttyUSB0. So I assume that the device is recognized by the OS