This was driving across the border for an extended vacation. I'm not going to post every detail, but I had a vague itinerary and I completely understand why we got extra questions. However, I hadn't done anything suspicious at all. It is a question of rights, and as a non Canadian citizen, you have no rights other than to decide not to go to Canada anymore. They were looking for evidence of drug smuggling, proof that I could financially afford to take care of myself if something went wrong, and "hate speech". That is what the officer said. You may find this reasonable, but how thoroughly they search your phone is entirely up to the officer at the border, and they have every ability to just image your phone.