This can be solved by having a system in place with two passwords and partitions: assuming the phone is already locked, entering the second password unlocks a decoy phone account without anything incriminating, but at the same time encrypts or wipes the actual/main account. Entering first password unlocks the main account. The agent has no way of knowing if the first/second is being used.
That's theoretical since no mobile OSes support it. And unless your decoy partition has a full life of data in it they will easily tell that it's fake.
When I can't avoid flying, I carry a special "travel phone" that I don't use for anything else instead of my daily. I know I'm not the only one. That also lacks the "full life of data" despite not being fake at all.
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This can be solved by having a system in place with two passwords and partitions: assuming the phone is already locked, entering the second password unlocks a decoy phone account without anything incriminating, but at the same time encrypts or wipes the actual/main account. Entering first password unlocks the main account. The agent has no way of knowing if the first/second is being used.
That's theoretical since no mobile OSes support it. And unless your decoy partition has a full life of data in it they will easily tell that it's fake.
When I can't avoid flying, I carry a special "travel phone" that I don't use for anything else instead of my daily. I know I'm not the only one. That also lacks the "full life of data" despite not being fake at all.