They can demand, and you can refuse. However if you have Face ID or other biometric measures, they can (legally) force your finger onto the sensor or hold the phone up to your face to unlock it for their needs.
Passwords are personal data, faces and fingerprints are not, apparently.
>Passwords are personal data, faces and fingerprints are not, apparently.
The rulings you're referring to are based on the Fifth Amendment. They don't involve the privacy rights of the Fourth Amendment. Rather, they treat the act of revealing your password as testimonial: if you say "my password is hunter2", you are testifying; and the Fifth Amendment says you cannot be forced to testify against yourself; so you cannot be forced to reveal your password.
You can scan your fingerprint or face without speaking a word, so those acts are not testimonial, and forcing you to do them would not implicate the Fifth Amendment. Similarly, brute forcing your password, or searching for it written down in your notes, would not implicate the Fifth Amendment.
That’s like saying if my house is protected by a passcode lock, the cops can just break down my door and walk in. Sure, they can, but there are clear rules of when they can enter and search my property without my consent. So, sure, they can enter my phone, but that doesn’t mean they have the right to in the first place.
The comment you’re replying to specifically discusses Fifth Amendment rights. The police would not generally be violating those rights by entering your house without a warrant. That would be a Fourth Amendment issue.
(One might argue that breaking your door without due process of law would be a Fifth Amendment violation. I have no idea what existing precedent says about that.)
Android has something similar - in the power menu [1] there's a "Lockdown" button which will lock your phone, disable biometrics, and disable showing notifications until you unlock with password.
Depending on your version and flavour of Android you may need to enable this "Show Lockdown Option" in your settings.
[1] Opening this varies - my pixel is power + vol up, some phones are hold power, etc.
People want to get into the US without having their personal thoughts searched. US citizens also have the right to enter the US without personal thoughts searched.
The biggest thing is to set your device up on arrival to be powered OFF. Most of Cellebrite (and other security vendors) solutions rely on the phone having been unlocked once since first poweron (or "AFU").
Even better would be to not even bring a phone in the first place, and get a temporary one after arrival. Or get a prepaid one beforehand with nothing on it, if you're confident that won't be suspicious.
