Someone should make an app to offload all your data to a personal cloud before going to the airport and then reload it into the phone after going through customs
In the case of Apple, couldn't you reset the phone, sign in to a backup iCloud account, and then repeat the process with your real account once you're clear? Not a fast process, but most people have GBs of personal data so nothing would be quick anyways.
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All backup apps work, no special requirements. Seedvault for my LiniageOS.
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