HUAWEI MG323 GSM M2M Module
AT Command Interface Specification Commands for Security Control
Issue 02 (2010-11-23) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd. 47
<passwd>: string, which can be or may not be placed inside quotation marks. This
parameter corresponds to the password of <fac> and can be modified through
+CPWD. When mode is set to 0 or 1, this parameter is mandatory. When mode is
set to 2, no password is required. The characters inside the string must be obtained
from ‘0’–‘9’. Otherwise, an error is returned directly.
<class>: integer, which indicates the service type.
z 1: voice call (not supported currently)
z 2: data
z 4: fax (not supported currently)
z 7: voice+data+fax (not supported currently)

5.2.3 Examples

Example 1:
Lock the SIM card.
AT+CLCK=“SC”,1,“1234”
OK
Example 2:
Unlock the SIM card.
AT+CLCK=“SC”,0,“1234”
OK
Example 3:
Query the locking status of the SIM card.
AT+C LCK =“ SC” ,2
+CLCK: 0
OK
5.3 AT+CPWD - Command for Modifying the Password
The AT+C PWD command modifies the password.