how to use upgrade ios 9

Update your device wirelessly

If a message says that an update is available, tap Install Now. You can also follow these steps:

1. Plug your device in to power and connect to the Internet with Wi-Fi. 

Connect to a Wi-Fi network

1. From your Home screen, go to Settings > Wi-Fi.
2. Turn on Wi-Fi.
   Your device will automatically search for available Wi-Fi networks.
3. Tap the name of the Wi-Fi network that you want to join.

After you join the network, you'll see next to the network and  in the upper-left corner of your display.

 2. Tap Settings > General > Software Update.

 

 

 3. Tap Download and Install. If a message asks to temporarily remove apps because iOS needs more space for the update, tap Continue or Cancel. Later, iOS will reinstall apps that it removed. If you tap Cancel, learn what to do next. 

 

 

4. To update now, tap Install. Or you can tap Later and choose Install Tonight or Remind Me Later. If you tap Install Tonight, just plug your iOS device in to power before you go to sleep. Overnight, your device will update automatically.

5. If asked, enter your passcode.