Oh yes. And the wonderfully meta variation:

"It's a pocket computer with a phone added on."

Why meta? Because "with a phone added on" is a phrase tacked on to the central concept ("pocket computer") which adds some value to the sentence, but not a great deal...

EDIT: wolfpac72, you Nokia apologizer! How dare you mock the fact that the N900 lacks Provisioning!

(... by the way, I had to do some research on that term. Trust Microsoft to take a word like "Provisioning" and twist its meaning to the point where it almost means the opposite of its original meaning...)