Apple said it has shipped its three-billionth iPhone, marking a new milestone for the 18-year-old device that remains the company’s single largest revenue generator. Chief Executive Officer Tim Cook disclosed the figure on 31 July during Apple’s fiscal third-quarter earnings call, noting that the cumulative total has been reached since the smartphone’s 2007 debut. The pace of adoption is quickening. Apple needed nine years to sell its first billion iPhones by July 2016, another five years to cross the two-billion mark around September 2021, and just under four years to add the most recent billion. In the June quarter, iPhone sales climbed 13 percent to $44.6 billion, almost half of the company’s $94 billion in total revenue, helping Apple top analysts’ estimates. Cook said tariffs raised costs by about $800 million in the quarter and are expected to weigh by $1.1 billion in the current period, but he added that Apple is "significantly growing" its investments in artificial-intelligence features—branded Apple Intelligence—which he expects to propel the next wave of iPhone demand.