[tsimionescu]

Sure - I'm just pointing out that it's pretty well accepted that they have a right to access your data for inspection when you cross the border, just as they do your luggage. I'm not happy or supportive of this, but it seems to be a lost battle absent new legislation.

The only consideration then is that they can't force you to help them access it. The fact that it's your data is irrelevant. This matters a lot if, for example, you have a copy of your password written down with you - as they are very much allowed to use that to acces your phone. Or, even more plausibly, if your phone is protected only by a biometrics, in which case they can compel you to provide those biometrics and access the phone that way.