I'm not sure google maps is always consistent....here's the anecdote.
A buddy of mine and I were in San Fran to visits some other grads, and we were looking for a steak restaurant near Berkley.
My buddy has an iMobile and found 4 within 0.5 miles. 3 of them were non-existent.
As this place is only a few miles from Google Inc., I would say this is disturbing, and not useful. How many business get NO referrals?
But without 3G , we would have been out of options...