Fewer iPhone users are updating to iOS 26 than they did with iOS 18

The iOS 26 update has the second-worst adoption rate of all iOS releases since 2015, falling behind both iOS 18 and iOS 8.
iOS 18 (left) adoption rates were better than those of iOS 26 (right).
Though all eyes might be on iOS 27 and its AI-infused Siri, which debuted at WWDC, the software has only entered beta testing.Most iPhones, or 79% of all devices to be more precise, are currently running iOS 26. This is according to Apple's App Store data for June 2026, which also revealed that 86% of all