For me the point of the article is the strategy Mr. Google uses currently in other fields: They offer you a product for free, a product way better that other (even paid) offerings, to capture the market and to collect data and serve ads inside those products. This doesn´t apply to Android so much, but take Gmail, Google Maps, Search, YouTube. All these services are ostensibly given away for free (like AT&T phones in the article), but have their performance compromised by ads everywhere plus they siphon the user data like a vacuum.
So to paraphrase your criticism: Google doesn´t sell its maps, but pushes the paid listing with larger map icons. Google doesn´t sell its search, but gives adverts when you´d expect the honest best result for your query. Google doesn´t sell the videos (barring the paid offerings), but prepends and interrupts them with ads.
This article just applies these tactics to something we are so familiar with - the phone service.
>>services with near-zero marginal cost
I might be loking at this from the point of view of current, digital, automated and interconnected networks, but the way I see it, a phone network has near-zero marginal costs, too. Once you have built the network, your marginal cost per-call are quite low. I´d say comparable to relaying an email or replying to a search query once the infrastructure is in place.