Apple wasn't joking around when it warned that the Chinese smartphone market gave it grief in the fall. IDC estimated that iPhone shipments fell just shy of 20 percent year-over-year toward the end of 2018, hitting 11.8 million. It's the third consecutive year of declines, the analyst group said, blaming this year's drop on a combination of higher prices and relatively modest updates. Customers just weren't in as much of a rush to upgrade as they were in years past. Throw in China's economic woes and stiff competition from local rivals and it's not shocking that iPhone sales took a dive.