The most remarkable thing about the iPhone as a technology product is that it has been able to maintain pricing stability for over five years. As the following chart shows, the revenues per unit sold for the iPhone (as reported by the company) have held even as volumes grew exponentially.
The latest version of the product should see no significant change in this pattern. I show below the price spectrum of the iPhone as available unlocked in the US (therefore assuming no sales taxes or VAT and no subsidy). I also highlighted the average revenue per unit from the latest four quarters.