According to Strategy Analytics, iPhone shipments over the past 10 years total 1.2 billion units-- and if the next iPhone retains this successful streak it is set to become the "first trillion-dollar smartphone" by end 2018.
“We estimate the iPhone has cumulatively generated $760bn of global revenue for Apple between 2007 and the most recent quarter of Q2 2017," the analyst says. "Revenues continue to grow and we predict the iPhone will become the world’s first trillion-dollar smartphone by the end of 2018.”
So far the best-selling smartphone model is the iPhone 7, the result of sleek design, large app ecosystem and an extensive global retail presence. As such, it remains "wildly popular" in all major markets, with the exceptions being China and India, where local competition from Chinese brands and high pricing make it tough for even Apple to gain traction.