I'd be willing to bet that they don't. iPhone prices are set at the highest price that Apple determines people are willing to pay, not by the cost to produce it; even the costs that do exist are mostly materials, not labor costs. Labor costs are close to 1% of the sticker price [1]. This is the same as the argument that erroneously claims that if you paid fast food workers well it would lead to $10 big macs, when other countries with much higher wages have comparable prices to ours.

[1] https://www.investopedia.com/news/what-it-costs-apple-make-i...