Earlier iPhone models (click on your model to download iOS 11.4):

What's New:

  • Unlock iPhone to allow USB accessories to connect when it has been more than an hour since your iPhone was unlocked.
  • Fixes an issue that prevented some users from viewing the last known location of their AirPods in Find My iPhone.
  • Improves reliability of syncing mail, contacts, and notes with Exchange accounts.

What's new in iOS 11.4:

iOS 11.4 includes AirPlay 2 multi-room audio, support for HomePod stereo pairs, and Messages in iCloud. This update also includes bug fixes and improvements.

AirPlay 2

  • Control your home audio system and AirPlay 2-enabled speakers throughout your house
  • Play music at the same time on multiple AirPlay 2-enabled speakers in your house, all in sync
  • Control AirPlay 2-enabled speakers from Control Center, the Lock screen, or AirPlay controls within apps on your iPhone or iPad
  • Use your voice to control AirPlay 2-enabled speakers with Siri from your iPhone or iPad, HomePod, or Apple TV
  • Take a call or play a game on your iPhone or iPad without interrupting playback on your AirPlay 2-enabled speakers

HomePod stereo pair

  • This update supports setting up your HomePod stereo pair using your iPhone or iPad
  • HomePod pair automatically senses its location in the room and balances the sound based on the speakers' locations
  • Advanced beamforming provides wider soundstage than traditional stereo pair
  • HomePod will automatically update to support stereo pairs, unless auto updates are disabled in the Home app

Messages in iCloud

  • Store your messages, photos, and other attachments in iCloud and free up space on your devices
  • All your messages appear when you sign into a new device with the same iMessage account
  • When you delete messages and conversations they are instantly removed from all your devices
  • To turn on Messages in iCloud, enable Messages in iCloud settings (Settings > [your name] > iCloud)
  • Your conversations continue to be end-to-end encrypted

Other improvements and fixes

  • Enables teachers to assign their students reading activities in iBooks using the Schoolwork app
  • Fixes an issue where certain character sequences could cause Messages to crash
  • Addresses a Messages issue that could cause some messages to appear out of order
  • Addresses an issue that could prevent logging in or accessing files on Google Drive, Google Docs and Gmail in Safari
  • Fixes an issue that could prevent data syncing in Health
  • Fixes an issue that could prevent users from changing what apps can access Health data
  • Resolves an issue that could cause an app to appear in an incorrect location on the Home screen
  • Fixes an issue where CarPlay audio could become distorted
  • Fixes an issue where selecting music from your iPhone could fail when playing music over Bluetooth or when connected to USB on some vehicles

Previous versions:

Download links for iOS 10.1.1 (previous version) 2016-11-01:

Download links for iOS 10.1 (previous version) 2016-10-25:

Download links for iOS 10.0.2 (previous version) 2016-09-23:

Download links for iOS 10.0.1 (previous version) 2016-08-25:

Download links for iOS 9.3.5 2016-08-25:

Download links for iOS 9.3.4 2016-08-04:

Download links for iOS 9.3.3 2016-07-19:

Download links for iOS 9.3.2 2016-05-16:

Download links for iOS 9.3.1 2016-04-04:

Download links for iOS 9.3 2016-03-22:

Download links for iOS 9.2.1:

iPhone 6s Plus (iPhone 8,2)
iPhone 6s (iPhone 8,1)
iPhone 6 (iPhone 7,2)
iPhone 6 Plus (iPhone 7,1)
iPhone 5s China (iPhone 6,2)
iPhone 5S GSM (iPhone 6,1)
iPhone 5C Global (iPhone 5,4)
iPhone 5C GSM (iPhone 5,3)
iPhone 5 Global (iPhone 5,2)
iPhone 5 GSM (iPhone 5,1)
iPhone 4S (iPhone 4,1)

Download links for iOS 9.2:

Download links for iOS 9.1:

Download links for iOS 9.0.2:

Download links for iOS 9.0.1:

Download links for iOS 9.0:

Download links for iOS 8.4.1:

Download links for iOS 8.4:

Download links for iOS 8.3:

Download links for iOS 8.2:

Download links for iOS 8.1.3: