Apple’s new iOS 11 software has been installed on 25% of compatible devices since it launched ten days ago, a marked drop on iOS 10 adoption rates in 2016.
Last year, 34% of iPhone and iPad users had made the move to iOS 10 in the same time period, according to analytics firm Mixpanel.
The reasons for the slow rate are unclear, although last year’s iOS 10 woes, which saw users complain of bricked devices and a host of other software niggles, may well have played their part.
Apple has also held back features such as the ability to pay other iPhone owners via Apple Pay, meaning some of iOS 11’s most eye–catching additions aren't available right now.
Apple has yet to reveal official figures, but is unlikely to be overly concerned with the slower rate compared with last year.
iOS 11 has not had nearly the same level of glitches as iOS 10, with no reports of any major bugs since its launch.