- Fewer iPhones are on iOS 26 than on most previous updates.
Apple’s App Store data shows that 79% of all iPhones run iOS 26, but the rollout ranks as the second‑worst since 2015, trailing only iOS 8. The figure is especially low for a mature OS: 86% of devices launched in the last four years have upgraded, meaning many older models are still on prior versions.
The slow pace matters because developers rely on fresh OS features to ship new apps and updates. A tepid upgrade curve also hints at user fatigue or concerns about the beta‑stage iOS 27 that Apple highlighted at WWDC.
Historically, Apple sees 90%+ adoption within weeks of a release, so iOS 26’s lag is a notable deviation.