Not a political judgement, just a data point. I don't think poor folks buying older or used iPhones is prevalent, in NYC at least.
Until you can tell us how many smartphones you see, what percentage of them are iPhones, how often you see them, how the iPhone was acquired, and the apparent class of the person carrying it, you're just saying things that reinforce your viewpoint without any way of disproving it. Might also help if you can admit any bias you have to start with - do you really think that poor people are poor because they can't budget, spend unwisely, and are lazy?