RESET error counter (0x2c) or unblock chv

i am getting somethin like 00 2c 00 01 00 00 20 00 01 00 00 2c 00 81 00 i see somewhere 0x20 is defined as "verify chv" and 0x2c is defined as "unblock chv" but i also see somewhere else saying 0x2c is "reset error counter" can someone point me to where these commands are defined, and what kind of response are expected from SIM ??? thanks tom --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus