Your Phone, Your Data: How to Safeguard Your Digital Life When Entering the U.S.
rnlawgroup.com
rnlawgroup.com
Burner phone + just a couple phone numbers for family at home + Session. That's how I travel anywhere.
While that helps I wouldn't pretend that makes it's encryption all that great it's old. They can clone the OS, stick it in a FBI database and break it anytime they decide it's worth going after.
The best defense is just don't take your personal phone anywhere near a 5-eyes border patrol area. This isn't just about the USA, it's even easier to take your phone in a western EU nation than here.