I avoid texting on my iPhone with it's tiny screen.
It makes me appreciate my SGS III even more, since I'm very fast with two hands, in the landscape mode. The vertical space is so much greater that I have lots of room to work. Accuracy, speed, and room are the distinct advantages of a larger display.
Too bad Apple decided to restrict iPhone 5 to one half of an upgrade via a longer yet equally narrow display. In landscape the vertical space is exactly the same as their tiny 3.5" predecessors...
What was Apple thinking ?