Then why does Apple sell a "sim-less" phone? If they have a sim-less, then common sense dictates the other must be sim-full.
Then you don't tell us where you are posting from. AT&T only the U.S., I dunno. Canada has AT&T? Are there third world att copy-cats?
So what if it doesn't come with a sim, you gotta sign up with a cellular carrier sooner or later and they will give you the sim, or are you planing to use an expensive smartphone to play music only?