Re: "Safari suddenly no longer preventing trackers effectively?"
Wondering which iOS version is currently installed on your iPhone 15.
Seems iPhone now has more security than ever before,
About iOS 18 Updates - Apple Support
lists the new features and security updates that have appeared in recent iOS 18 versions ...
the latest version is iOS 18.5
Eg: says of iOS 18.2 : "This update introduces new features powered by Apple Intelligence, the personal intelligence system that unlocks powerful new ways to communicate, work, and express yourself, all while protecting your data with an extraordinary step forward for privacy in AI."
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Re: What has caused this sudden change in tracking prevention?!
About "Intelligent Tracking Prevention" : Safari Privacy - Apple
Eg: says:
"Some browsers allow websites and data collection companies to watch you as you browse across multiple sites and create a profile of you. Intelligent Tracking Prevention uses on‑device intelligence to help prevent those trackers from learning who you are and what you’re interested in".
More info: Apple's Privacy website: Privacy - Control - Apple