Siemens TC37 Module At Command Reference page 98

AT Command Set
· Wait 10 seconds after PIN input before using SMS related commands.
· <pin> and <new pin> can also be entered in quotation marks (e.g. "1234").
· To check the number of remaining to attempts to enter the passwords use
· See also Chapter 7.2 „Summary of PIN requiring AT Commands".
· See Chapters 4.34 and 6.36 for information on passwords.
TC3X_ATC_01_V04.00
agreement between home network and currently available operators etc.
The ME offers various options to verify the present status of network
registration: For example, the AT+COPS? (Chapter 4.26) command
indicates the currently used network. With AT+CREG (Chapter 4.37) you
can also check the current status and activate an unsolicited result code
which appears whenever the status of the network registration changes (e.g.
when the ME is powered up, or when the network cell changes).
the AT^SPIC command. See Chapter 6.32.
Page 98 of 204 29.05.2002