I was listening intently this morning and the OP's "quotes" are embellished. Howard did not say "most people don't know" and "it's a fact." While I believe Howard could possibly have inside info because he and his people are very well connected in Hollywood and Southern California, I think it's more likely that he picked up his info while reading the speculation just like the rest of us.
I know he's well-read and keeps up to date on tech trends. But he's also proven to be susceptible to internet rumors in this area, which he'd be the first to admit. One of the great things about Howard Stern is that, in many ways, he's just like the rest of us...he's reading the things we read about and talking about the things we're talking about. If you can tolerate all the stripper and "pooooosy" talk, he really represents a lot of the same mainstream-type things that we do here.
Oh, and he uses a Verizon iPhone. He is very, very negative about AT&T service...