Best course of action for travel when I know my phone could be searched?

I had an incident at the border many years ago (traveling from Canada to US) when trying to travel with my family. One member in particular was denied entry and the rest of us were with them and turned away as well. I have a boyfriend from the US now and want to visit him but I suspect I'm going to be flagged and questioned. I don't have anything to hide but I know they can refuse you based on …

action border canada course entry family incident phone privacy rest travel