Apple is rolling out iOS 27 to the public on Monday, September 14, with a rebuilt, AI-powered Siri among the headline changes. For existing iPhone owners, multiple outlets recommend doing basic preparation steps ahead of the update to reduce the chances of delays, failed installs, or performance issues during and after the upgrade.

Preparation guidance focuses on updating the current iPhone software first, backing up data, ensuring sufficient storage, and updating apps. One report notes that Apple introduced indexing optimizations in iOS 26.6—used to help manage reindexing delays that can occur with major updates—and that your phone may begin reindexing in the background if you have stayed on iOS 26.6 or later for a few days. Both outlets advise freeing storage space so the download can complete, and backing up to iCloud immediately before updating, while also keeping the device on Wi‑Fi and sufficiently charged.

There are small differences in emphasis: one outlet highlights iOS 26.6’s background indexing as a way to smooth the iOS 27 transition, while the other stresses practical steps like charging, stable Wi‑Fi, and allowing time for installation. Coverage also notes that iOS 27 follows the same basic eligibility list as iOS 26, though some AI capabilities may depend on newer hardware.