Do you think it's possible that most poor people don't do that, though? Who do you think the $6/mo deals are made for?
I mean, I don't have any data, feel free to prove me wrong. But when I was a poor student, I wouldn't even dream of buying a smartphone outright, yet alone an iPhone.
And I had a look, those $6/month contracts barely subsidise anything. I don't really get what's relevant about them.