it means he/she prefers a smaller size. Is it inconceivable that someone could think all smartphones on the market are too big? This is hardly as ridiculous as you imply
Warm-season clothing, a t-shirt and jeans. It means the phone has to fit comfortably in front/back pocket. If it doesn't, it could be labeled as nonportable.
Who are this people who keep their phones in their back pockets?
(And I never had an issue with the iPhone 7 plus not fitting on my front pocket with room to spare -- even less so one would presume with the much smaller X).
