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> completely impossible There were many 3rd party browsers on the App Store with ad blocking support since iOS 4 or earlier.

• jonknee 11y ago
  But no way to set them as the default browser so links that open up from apps were still opening in Safari with the ads.
  • seanp2k2 11y ago
    Jailbreak made it possible, or you could set up an ad-blocking proxy on your network.
    • jonknee 11y ago
      Yes or now any of dozens of apps in the App Store which is what makes it a turning point.