Last year, Apple published its first update on iOS 14 adoption on December 16, saying that iOS 14 was running on 81% of all iPhones introduced in the last four years and 72% of iPhones, regardless of release date.
This year, Apple has provided its first update on iOS 15 adoption nearly a month later, and adoption numbers are slightly lower at 72% and 63% with the same criteria.You can update to the latest version of iOS 15 as soon as it’s released for the latest features and most complete set of security updates.