More details about device lock code and un/locking the device with SMSCON: After explicitly changing the lock code of my N900, the device will lock without asking for lock code any more. This works even if "new" code is 12345 (which is default) as well. So, changing the lock code at least once is a good idea for all SMSCON users. COM_UNLOCK or "unlock on new SIM" unlocks the phone without knowing the lock code. As a prerequisite SMSCON daemon must run and - for COM_UNLOCK - must be able to receive commands. If the phone (re)boots in locked state, then the unlock code is been asked before the SIM-PIN is being asked for. The consequence is that SMS commands are NOT received by the phone while locked in boot phase! In my tests, the phone has not even WLAN access in this phase. Which means that checking the remote command server is also not possible. Now being aware of the above it becomes more clear why SMSCON has a UNLOCK on new SIM function: It allows you to contact the phone again if the finder person stuck at reboot and is clever enough to replace the SIM. And further it gave me ideas how to improve SMSCON functionality ...