They can detain you indefinitely until you give up your password, so it doesn’t matter.
There are no laws at the border, even the constitution doesn’t apply for US citizens there.
There are no laws at the border, even the constitution doesn’t apply for US citizens there.
https://www.thenation.com/article/66-percent-americans-now-l...
https://www.aclu.org/other/constitution-100-mile-border-zone
Plenty of laws apply. They thing to remember is that you can't give up something you don't have. Use a blank dumb phone when crossing, restore afterwards.
Turning up with a burnder phone is a guarantee that you're going to spend hours in an immigration office.