The protection password is a numeric password that you select when activating the Anti-theft feature. The protection password will be used by you when trying to locate or lock your lost phone.
For example by sending: LOCK *your protection password* to your own number FROM the secondary number to lock the phone if it is stolen.
The password can be changed in the app. If you have forgotten your password, you can send the following text message to your mobile number FROM the secondary phone number that is set: RESET
You're now going to receive a new password via SMS to the secondary mobile number.