Semiliterate

When I get a phone call, my Caller ID tells me who it is. Of course, a lot of the time it says "Unavailable", but that means "Don't bother", as far as I'm concerned. I liked the identification "Illegal Scam" that it gave me a couple of times. But lately there've been a number of calls audibly IDed as "Not Eye En Service". I don't always hear the first iteration very well, but the second one has been clear; it took me a time or two to figure out what it was actually saying.