screen /dev/USB0 or /dev/ttyUSB0 (check dmesg when you plug your usb to ensure that) The following commands will not be echoed - the easiest way is to prepare commands and copy paste to avoid typos. Others tools than screen exists but I found screen widely used in command platform. ATZ should return OK AT+CPIN? should return +CPIN: SIM PIN indicating SIM PIN is needed AT+CPIN="xxxx" replace xxxx by your PINCODE. should return OK. you have access to the SIM AT+CLCK="SC",0,"xxxx" replace xxxx by your PINCODE. disable pin code The following keyboard sequence will exit screen: ctrl+a k y Setting the pin to 0000 usually disable it.