“With this method in place, Safari is opened upon first launch in order to read a cookie that may exist from a user’s past interactions with ads,” Perez reports. ” In terms of the user experience, it’s not ideal, but it is one that some app makers are utilizing as an alternative to the deprecated UDID – the unique device identifier that Apple first announced plans to phase out back in mid-2011.”
Perez reports, “Apple likely wants developers to start transitioning to its own Ad Identifier technology. The Advertising Identifier, as explained in Apple’s iOS 6 Settings (General –> About –> Advertising –> Limit Ad Tracking), states that ‘in the future, all advertising networks will be required to use the Advertising Identifier.’ In other words, Apple’s intention is that this method should eventually become the standard.”
Much more in the full article here.
Apple’s iOS 6 delivers new tracking technology for advertisers; users have option to disable – October 11, 2012
Apps not using UDID data getting 24% lower ad prices – April 25, 2012
Amid privacy concerns, Apple has started rejecting apps that access UDIDs – March 25, 2012
Apple makes big change to iOS 5: Phasing out developer access to UDID – August 20, 2011