The move will likely increase the number of people whose iPhone activity is tracked by advertisers, because in newer versions of Apple's iPhone operating system (iOS 6 and later), the privacy controls are situated in the "General" menu within Settings, and not in the "Privacy" menu. Tracking is on by default. Users must choose to switch it off if they do not want to be tracked. (Here are some instructions for switching off tracking.)
IDFA is similar to a cookie — it allows advertisers to know that a specific iPhone user is looking at a specific publication and can serve an ad targeting that user.
The tracking is anonymous. It doesn't show advertisers any personally identifying information. But it does show them what you're doing and what you're interested in.
Apple had stopped supporting developers and advertisers who were using other ways of tracking people on their iPhones, AdExchanger reports. Now Apple is removing access to information from advertisers who are still trying to use those old methods.
And in May, Apple began rejecting apps that used the old system, UDID, from its App Store.
The company wants all advertisers to use IDFA, in other words.
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