Don Romano (alt)iPhones are usually considered pretty good for privacy, but I just found out about an Apple ad tracking system I didn't know about before:
https://blog.mozilla.org/blog/2019/04/15/the-bug-in-apples-latest-marketing-campaign/
It can be turned off in the settings, and the tracking ID can be reset, but as the blog entry from Mozilla points out, it would be better if it wasn't enabled to begin with, or if they at least asked you for permission during initial setup or after upgrades.
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