Apple and AT&T make their own ads, and so does Verizon.
Yeah but I have never seen an AT&T iPhone ad, just Apple. Even when Verizon was slamming AT&T with their "There's a map for that!" commercials. Which was kind of a slam at Apple's "There's an app for that!" When AT&T responded, it did so with other phone models and Luke Wilson.
Apple responded also with a "Can your network do that?" ad with regards to the iPhone capabilities.
So two companies with different ads but targeted against the same entity, Verizon.