Apple has sold three billion iPhones since the product was launched in 2007, Apple CEO Tim Cook said Thursday during the company’s third-quarter earnings call.It took Apple nine years to sell the billionth iPhone, a milestone the company reached in 2016. This implies that Apple sold two billion between 2016 and now — also a nine-year period — marking the product’s growing popularity. While Apple celebrates three billion iPhones sold, the company has struggled a bit in the stock market this year, as the tec ...