Phones have evolved into communicators that are used primarily for texting, checking email, and web surfing. Now instead of the smallest thing you can hold to your face, we want the biggest thing we can read but still tuck into a pocket.
Well, depends entirely on one's age and profession, and dare I say, gender. Some people do need to speak w/ clients and cohorts out of the office. Some people don't work in that kind of job. Kids mostly text, not converse. Women like to talk w/ friends more than text. Men prefer to text, not talk, unless it's to their girlfriend or newlywed wife, which is mandatory. So, everyone's situation is different and with that size desire is relative to how one uses their phone.