Uh, no. Ting supports iPhones and they have $6/mo plus pay as you go. That isn't an "expensive ongoing payment" at all.
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.