Apple Inc.'s latest smartphone lineup won favorable reviews from Chinese consumers thanks to its competitive pricing, although supply constraints and competition from local brands remain challenges in one of Apple's most important markets. The Cupertino, California-based company showed four iPhone 13 models Tuesday at its annual September product introduction. They adhered closely to previous designs but included improvements in camera functions, processing power and battery life. In China, consumers latched onto the comparatively low price of the latest iPhones, which cost about as much as iPhone 12s did a year ago. By Wednesday morning, the topic "iPhone 13 price" had...