Just and idea for Android: If you are rooted: Make a backup with nandroid and put it somewhere encrypted on your laptop or cloud. Make Backup with root, syncthing and rsync of your sd card (it's so complicated because many cannot remove internal "SD"). Reset phone. Cross border. Restore both backups.
The question is: WHY I need to this counter measures to protect my right of privacy when entering a country like the USA.
The question is: WHY I need to this counter measures to protect my right of privacy when entering a country like the USA.