# Get your iPhone ready for iOS 27

> A five minute checklist that keeps the big Siri update from turning into a bad afternoon.
- Title: Get your iPhone ready for iOS 27 · Engadget | Shortify
- Summary: A five minute checklist that keeps the big Siri update from turning into a bad afternoon. Free up 18 to 25GB, stay plugged in on Wi-Fi, and back up before…
- Keywords: ios 27, iphone, apple, software update, siri, technology, news, Get, ready, iOS, Engadget
- Source: Engadget — https://engadget.com/2252944/prepare-iphone-ios-27-update
- Author: Jack Peachey
- Published: 2026-09-14T13:30:00+00:00
- Read time: 1 min
- Topics: ios 27, iphone, apple, software update, siri, technology, news
## iOS 27 reaches back to the 11
The update brings UI refinements and a rebuilt Siri meant to compete with Gemini and ChatGPT. It runs on iPhones as old as the iPhone 11.
## Clear 18 to 25GB first
The installer needs room for the download plus temporary files. Aim for roughly 18 to 25GB free before you start.

> The update process requires room for temporary files along with the main download
## Plug in, stay on Wi-Fi
Fifty percent battery should survive the install, but a charger is safer. Keep the phone on Wi-Fi the whole time.
## Overnight or right now
Settings > General > Software Update > Automatic Updates decides it. Automatic installs overnight while charging, which can land days or weeks late, so wait on the Software Update page if you want it immediately.
## Install iOS 26.6 first
That release includes an indexing update that smooths the handoff to the new Siri in iOS 27. Check for it before you jump.
## Back up, then install
Big updates can go wrong and take data with them. Use Settings > Apple Account > iCloud > iCloud Backup > Back Up Now, or a Mac or PC, and keep your Apple ID credentials nearby.

> don't forget to back up your device
## Key takeaway

Free up 18 to 25GB, stay plugged in on Wi-Fi, and back up before you tap install.