iPhones attempt to authenticate the port right now. A challenge system is in place if you connect an iPhone to a computer and want to authenticate it. The diffe

iPhones attempt to authenticate the port right now. A challenge system is in place if you connect an iPhone to a computer and want to authenticate it. The difference is that challenge is completely turned off with USB restricted mode. In other words, it's completely impossible for the challenge to start because the phone doesn't even let you talk to it while locked.