Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 178)

Security Commands
Change Password +CPWD
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WM_DEV_OAT_UGD_049 - 001 VOLUME 1 August 23, 2007
9.4 Change Password +CPWD
9.4.1 Description
This command is used by the application to change a password (PIN, call barring,
NCK, etc.). The facility values are the same as for the +CLCK command with a "P2"
facility to manage "SIM PIN 2/CHV 2".
For the network lock ("PN"), unlocking is forbidden after 10 failed attempts to disable
(unlock) the network lock with an incorrect password.
9.4.2 Syntax
Action command
AT+CPWD=<fac>,<oldpwd>,<newpwd>
OK
Read command
None
Test command
AT+CPWD=?
+CPWD: list of supported (<fac>,<pwdlength>)s
OK