I agree.

I've been using an iPad mini with Cellular as my phone-replacement mobile device since the day iPad mini came out. It fits in my pocket (not as comfortably as a phone, but well enough).

My only other device is a 15" MBP.

To be more accurate, the iPad mini is 7.9", not 7" though. And 4:3 aspect ratio. So in area, it's still much bigger than a 6.5" 16+:9 phone would be.