If you are using an iPhone 5c or later, you can update to iOS 10 by following these simple steps:

  1. Open the Settings app and select General.
  2. Scroll down and select Software Update.
  3. Tap on the Update button and wait for the update to install.
  4. Once the update has installed, open the Settings app and select Software Update again.
  5. Scroll down and select Install from iTunes Store if you have already installed iOS 10 from iTunes before. Otherwise, scroll down and select Install from iCloud if you have iCloud enabled on your device.
  6. Tap on the Update button and wait for the update to install again.