To add to that, the ruling intentionally did not make a decision on two important distinctions:

1. Forcing you to unlock - in this case, Alisigwe unlocked their phone willingly after being asked.

2. Forensic extraction - the ruling does not give authorities the power to run a sophisticated off-site break-in on your phone without reasonable suspicion.

So if you are a US citizen, and you are willingly unlocking your phone at the border (or you don't have a passcode), the Fourth Amendment no longer protect you from a suspicionless manual search of the phone at the border