On Sept. 12, Apple (NASDAQ: AAPL) launched three new iPhones. At the high-end of its product stack, Apple introduced the iPhone XS -- the direct successor to last year's iPhone X -- and the iPhone XS Max, a variant of the iPhone XS with an even bigger screen. For more price-sensitive customers, Apple offered a product called the iPhone XR, which incorporates many of the new technologies found in the iPhone XS/XS Max, but uses cheaper components in some cases to reduce the cost structure of the device.One way Apple seemingly chose to save money with the iPhone XR relative to the higher-end iPhone XS models is in the cellular subsystem.