U.S. iPhone users spent an average of $58 on apps last year
<p>U.S. iPhone users spent 23% more on in-app purchases (IAP) and premium apps in 2017 than <a target="_blank" href="https://sensortower.com/blog/revenue-per-iphone-2016" rel="noopener noreferrer">the year before</a>, Sensor Tower Store Intelligence data reveals. </p>