Ok, it says iOS is super secure and even Apple does not have a backdoor to bypass the security. Let say, you buy a new iPhone. When you return it, you locked the phone with your own security code that is hard to guess. My friend returned his phone and during the return process online, there seems to be no instructions that the phone must be in non-lock conditions to receive credit refund. If Apple claims is true, then the phone is now a brick to Apple. Let me know your thought.