It seems like the risk that they would discover both phones is not worth the reward of hiding the content on your everyday phone. I agree in principal that you

It seems like the risk that they would discover both phones is not worth the reward of hiding the content on your everyday phone. I agree in principal that you shouldn’t be compelled to unlock your phone at the border, especially on the way out, and I hope that we can change our laws to fix that. But as a traveler who just wants to get on my plane, I’m gonna swallow my pride and let them dig through my chat history or whatever, rather than risk them finding that I have a decoy phone, which basically guarantees I’m spending the night in some extralegal black site.