so why dont you just disable the lock code? i know it seems kind of stupid but look at it from the other angle...a thief steals your phone. he changes the sim card. then he gets a simple "hello" (example of a command for smscon that starts the tracking) sms. he doesnt even know that he is tracked so he uses the phone. then you can find him (with a couple of strong friends =P) and reclaim the phone. he will not have the balls to try that again =D

if you have a lock than the thief simply throws the turned off phone in the garbage and you never find it.

just my opinion..