You might think the most protective options are to completely wipe your phone before traveling, use a burner or travel without a phone. But the EFF’s Cope said that could actually raise suspicions.
“People are damned if they do and damned if they don’t,” Cope said. “If you cross the border with no data on your device, that itself can be seen as suspicious.”
Instead, if you want to seem cooperative but do have data or texts stored on your phone that you wouldn’t want to be accessed, Cope suggests deleting that information selectively rather than wiping your whole device.
According to EFF in the article