User guide

Appendix C. Unlocking a SIM Card
C-2
The modem should response with an “OK” which means the PIN code has been
accepted. This explanation assumes that the default code of “1111” is being used.
If you get an “ERROR” reply, be sure that the command was entered as shown. If
you continue to get an error response, contact the SIM Card provider to determine
if a different code is required.
The next step is to enter the command to deactivate the PIN code requirement. If
your PIN code is different from the “1111” then use this in the command in its
place.
AT+CLCK=”SC”,0,”1111” <Enter>
The modem should respond with an “OK” which means the command has been
accepted. If you get an “ERROR” reply, be sure that the command was entered as
shown. If you continue to get an error response, contact the SIM Card provider for
further information.
The final step should be to test that the SIM Card is unlocked and will remain
unlocked. Start by powering down the modem and then reapplying power. Allow
the modem to warm up for about 30 seconds. The test consists of attempting to
dial the 12-digit data number for the other SIM Card in the terminal emulator.
ATDT00<12-DIGIT DATA #> <Enter>
If you are able to dial the number without getting a prompt for a PIN code then the
code requirement is deactivated. The modem should respond with “NO
ANSWER” after several seconds. This assumes the other modem is not
communicating.