Users in Hong Kong (which has great internet access and where presumably the phone is not the only internet devide) appear to like large phones too. It seems counterintuitive but these phones were mostly being used two-handed, and their users had jackets/man-bags/handbags. I wonder if the reason is that users who use Chinese IMEs find the larger screen more convenient to write and view a decent amount of data at the same time.
While living in South America the amount of "big phones" really surprised me, as they seemed so impractical. When I realised after a while that many people used their phone as their only Internet device, it made a lot more sense.