Sorry to hear your troubles, sometimes these things happens; first, the siren could be turned off, but first you have to pair the device with your account on my avast web. As I understand, you moved your SIM from one device to another, trying to send a command from website to it, but it did not work, as the device has not been paired or, most likely, there was not internet connection available, so the command from the website has no chance to pass through. Also sending the code from locked device which has no SIM inside will fail. The right thing is to get SIM back to Samsung, insert your PIN, turn off the anti-theft and back up the data and applications. I know that this is too late for you, but may be it helps to anybody else..