Apple’s struggles were most worrisome in China, the world’s second-largest smartphone market, where sales fell 8 percent. The iPhone’s popularity there has waned since Huawei, which the Trump administration restricted from working with U.S. technology firms, introduced a new smartphone with 5G abilities last year. Last quarter, Apple’s share of smartphones sold in China fell 4 percent, according to Counterpoint, a technology research firm...Read More.