Siemens Brodersen MC55 AT Command Manual page 165

Note
• It is not recommended to use the
PIN1 verification. This is because after PIN1 verification the module will automatically try to register to the
network as though
AT+COPS
AT+COPS=2 which remains unchanged. Also, the test command should only be used after PIN1 authentica-
tion.
MC55_ATC_V04.00
Confidential / Released
command before passing the CHV (card holder verification) / SIM
AT+COPS
were 0, regardless of the settings done before with or without SIM, such as
Page 165 of 475 3/17/06