I’ll never bring my phone on an international flight again. Neither should you.
Quincy Larson
12K457

Since much more time is spent within borders than crossing them, even for the most frequent traveller, the odds of a 3rd party gaining access to a phone are just as likely in-country.

http://www.csmonitor.com/World/Passcode/2017/0202/Hunting-for-evidence-Secret-Service-unlocks-phone-data-with-force-or-finesse

By the same logic as in the article, one should never carry a smart phone at all… not a conceivable trade-off for most.