IMO, just reset the phone to factory before you head to the airport, and leave it that way as long as you are in a jurisdiction that makes you think your phone

IMO, just reset the phone to factory before you head to the airport, and leave it that way as long as you are in a jurisdiction that makes you think your phone is in danger of being searched. Restore from a backup when you get home. If you do get searched, give them the phone and let them search it.