Read previewThe last thing Tim Cook needs this year is for the iPhone to give him a headache. Unfortunately for Apple, that task could be complicated as signs emerge that its workhorse gadget needs a revamp. In its most recent quarter, Apple generated almost $70 billion of its $119.6 billion total revenue from iPhone sales. China, Apple's most important international market, has started to sour on iPhones, bucking a trend of growth in other regions. Apple's AI efforts, led by ex-Googler and senior vice president John Giannandrea, could introduce several AI features to iPhones that offer an edge over Chinese competitors.

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Persons: —, Tim Cook, Cook, Steve Jobs, Paul Sakuma, Will Wong, Wong, Wang Gang, Gene Munster, Munster, Dan Ives, John Giannandrea, Siri, Jobs Organizations: Service, Apple, Vision, Business, Macworld, Counterpoint Research, Vivo, Huawei, Wall Street Journal, IDC's, Devices, Research, Asset Management Locations: Cupertino, China, Greater China, Beijing, Singapore, IDC's Asia