Based in part on the Ghostery database; see Introducing Peace, my privacy-focused iOS 9 ad blocker (Marco.org) for more details; for iPhone, Peace requires >= 5s at this point
"For months, marketers have been worrying over the possibility that consumers might embrace ad blocking that’s made easier in iOS 9. Now iOS 9 is out, and within hours of its launch yesterday, a new ad blocker called “Peace” became the most popular paid app.New Ad Blocker "Peace" Tops iTunes Paid Apps Chart Within Hours
The Peace app was created by Marco Arment, former CTO of Tumblr and founder of Instapaper. It sells for $2.99 in Apple’s app store. Within hours of the app going live, it topped the iTunes chart for paid apps for iPhone."