Hi, a few notes. It is a good idea to check if is is Wifi connection already acitvie - then send email via that connection, if not then first try to activate wireless , if not succeed, then enable gprs and send it through it.
lock command always send reply even config deifne "no"
EnableDeviceLock(True) I've changed it to EnableDeviceLock()
Good idea to update it.
Also I've receiving 6 messages for any command, but from log I can see
DAEMON ERROR: failed to send SMS to "+6421......"
It is look like the sms got send but reporting some error. How to debug it?

+5 for Stealth mode should be ON. any way to remove received sms?