You can fit 5 fairly large-font lines or 4 huge-font lines with the phone sideways (for the big keyboard).
I like hackin' on it with a bluetooth keyboard so the whole phone display is my terminal -- if I could just find my ideal folding keyboard, or perhaps one of those recent sliding-keyboard revival phones
I like the iClever Wireless Folding Keyboard - mini version. It's tiny and easy to carry with a phone. You need to be a little more careful with where some keys are.