I bought the FP 4 in Canada. It works fine. You just can't register for the warranty. I used a UK based company that exports products to North America.
Physical SIM. No issues afaik. I just broke my old phone, ordered the FP 4 as my new one, and when it arrived I popped the SIM out of the old one and into the new. Never tried wifi calling so idk
I have, I'm asking about real world usage on Freedom. Depending on the bands available, battery life can vary significantly between carriers for the same device. ☺️