How Ads Track You on Your Smartphone

To be clear, Apple hasn’t unlocked a new market. If anything, it’s following Google’s lead. The native Android browser permits cookie dropping, and companies can track the unique IDs of devices running the mobile operating system, said Sephi Shapira, CEO of MassiveImpact, a mobile ad network. When it comes to being able to access a device identifier, he said, “Android is a nonissue.” On the other...