I watch trailers on my phone and would never think of watching the entire film on it. I'm trying to think of one movie that wouldn't be shortchanged by watching it on your phone.....

Background noise really. I wouldn't watch it on my phone as my first experience.

And I advocate heavily for seeing things in the theater. I love film and the experience of it all. But not every film for every reviewing requires undivided and pristine conditions for it. There's plenty of comedies I toss in as background on the phone to pull up while waiting for kids to finish activities and the like. Some TV shows I do the same with in just having them easily streamable from my Tivo on it.

Course, I also had my father complaining about how people watching movies on their laptops just made no sense.

Generational changes, habits change, etc.