This command locks, unlocks or interrogates a Module or a network facility <fac> (any kind of call barring
program). A password is mandatory for performing locking and unlocking actions, but not for querying.
The features of the Module that are affected by this are the keypad power-up operation and fixed dialing
list. When querying the status of a single call barring program <mode>=2, the <status> for each call type
will be returned.
For <fac>="SC", SIM Card PIN setting and for <fac>="FD", SIM Fixed Dialing memory setting, the
<class> is irrelevant (For more information about <class>, refer to the following table shows the +CLCK
parameters.). The <passwd> for "SC" is SIM PIN, and for "FD" it is SIM PIN2.