They have access to it if they threaten/indimidate/blackmail you into giving them access. Dummy phones are a real thing; saw a post today on masto by a company... person (?) who said they keep a stash of clean burner phones for when employees travel through US borders. These are all reasonable, and maybe even CalyxOS's decoy partition (does it still have that?). The larger problem is that few people will use these things, not even bringing a clean phone. And once they start threatening your family and your long-term safety and freedom, it's highly likely you'll give them access, if they know there is any access to be had. Which they increasingly do, because universal surveillance blah blah.
I have a phone running GrapheneOS. What would happen if I gave them my duress PIN at the US border when compelled to do so? If entered, the duress PIN will immediately wipe the phone.
In a fair judicial system, they will protect you if you have nothing to be guilty of. Also on the other hand, if they have a judicial warrent for your phone, then it'll be a crime to not produce it, or destroy it.
In a country with a lawless system, and this is a real story btw that happened to my friend: The ones with deleted whatsapp conversation or "lost phones" recived 10+ years extra while his peers who committed the same exact crime in the same group but opened their phones recieved 2 years. I myself have read the prosecution case papers where the judge added the crime of them deleting whatsapp conversations, and formatting or destroying phones.
If you’re not a citizen my absolutely uneducated answer would be: if you were suspected of having done anything like that you would be detained for tampering with evidence - because they would now detain you for tampering with evidence. I would have said this wouldn’t have been a huge issue before, they wouldn’t have anything to hold you on after that, but that is certainly not true now.
They have access to it if they threaten/indimidate/blackmail you into giving them access. Dummy phones are a real thing; saw a post today on masto by a company... person (?) who said they keep a stash of clean burner phones for when employees travel through US borders. These are all reasonable, and maybe even CalyxOS's decoy partition (does it still have that?). The larger problem is that few people will use these things, not even bringing a clean phone. And once they start threatening your family and your long-term safety and freedom, it's highly likely you'll give them access, if they know there is any access to be had. Which they increasingly do, because universal surveillance blah blah.
and your google searches plus dns queries.
You all don't encrypt your DNS?