Mine begins with 011 (yeah, relative newbie), which makes me think of international direct dialing. So, I remember it as 011 xxxx xxxx (3/4/4).

When I read it aloud, I tend to break it into 011xx xx xxxx (5/2/4). That makes no sense, really, but I think certain numbers lend themselves to aspiration more than others. I wonder why UA puts the first five together, since isn't four digits the guideline for a memorable code?

(okay, my question was answered above -- it was evolution, six plus five digits)