They will be disruptive to your life if you, as a U.S. citizen, refuse to unlock your phone on the U.S. border. But it is my understanding they cannot constitu

They will be disruptive to your life if you, as a U.S. citizen, refuse to unlock your phone on the U.S. border. But it is my understanding they cannot constitutionally mandate you provide a passcode to unlock your phone. But they may confiscate your phone from you.