Excellent article Quincy.
Let me play Devil’s Advocate for a second. Imagine I travelled to the US with a locked briefcase containing personal diaries and private papers. The border guard could quite legitimately ask me to open the briefcase to make sure it didn’t contain offensive material such as pornography or terrorist propaganda. What makes a locked phone any different? If you wouldn’t travel with your most personal details printed out on paper, you probably shouldn’t be travelling with them on your phone (or laptop). It’s hugely inconvenient but maybe this is just border control catching up with the 21sr Century.