Lots of excuses to search you
https://www.theverge.com/policy/634264/customs-border-protection-search-phone-airport-rights
assume everything you have on you will be searched at every border crossing
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And if you do take a phone with you across a border, have an alphanumeric PIN greater than 6 characters to unlock. Swipe and other things are "physical acts" which do not carry the same search and seizure protection as passwords
travel with cash only + no phone
