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My iPhone had a popup with yes/cancel for the update and then showed a badge on the icon when I declined at first.

• mikeash 13y ago
  They periodically check for new updates. You probably just happened to have a periodic check occur shortly after the update came out, just by pure chance. Everybody should see that prompt eventually, but it may take a day or two.
  • frankzinger 13y ago
    A day or two for an important security update is too long. I heard about this thing yesterday on HN and did the update manually. My dad and sister's iOS devices hadn't notified them yet when I told them about it today, more than 24 hours later.
    • mikeash 13y ago
      I completely agree. I'm just explaining why it might show up more quickly on some devices, purely due to chance.
      • frankzinger 13y ago
        Yeah, I should have replied to your parent.