To enable automatic updates on your iPhone, open the Settings app and go to General > Software Update > Automatic Updates. Then tap the radio button next to Download iOS Updates and the radio button next to Install iOS Updates.

  1. Open the Settings app.
  2. Then tap General. 
  3. Next, select Software Update.
  4. Then tap Automatic Updates.
  5. Finally, tap the radio button next to Download iOS Updates button and then the Install iOS Updates button. This will enable your iPhone to automatically download and install updates overnight when your iPhone is charging.
How to Enable Automatic

If your iPhone won’t update through Settings for some reason, you might be able to download and install updates from your Mac computer. Here’s how:

How to Update Your iPhone with a Mac Computer

To update your iPhone on a Mac, plug your iPhone into your computer with a USB cable. Then open a Finder window and select your iPhone from the left sidebar. Next, select General > Check for Update > Download and Update.

  1. Plug your iPhone into your Mac. You can do this with a USB cable.

    Note: Make sure that your computer is connected to a strong, reliable WiFi network first.

  2. Then open a Finder window. You can do this by clicking the half-blue, half-gray face icon in your dock. Or you can click any empty space on your desktop and press the Command + N keys on your keyboard at the same time.
  3. Next, select your iPhone from the left sidebar. Your iPhone should show up under Locations. If you don’t see it, scroll down to the bottom of the left sidebar. If you still don’t see it, click Finder in the menu bar at the top of your screen and select Preferences. Then click the Sidebar tab at the top of the pop-up window and check the box next to CDs, DVDs, and iOS Devices.

    Note: If this is the first time you have connected your iPhone to this Mac, you will have to click Trust on your Mac and then tap Trust this device on your iPhone. Then you will have to enter your iPhone’s passcode.

  4. Then select the General tab. You will see this near the top of the Finder window. Before updating, be sure to back up your iPhone’s data to your Mac. To do this, click on Backup Now.
  5. Next, click Check for Update. This will tell you if there is an available update ready to download.Mac Computer
  6. Finally, click Download and Update. When asked to verify, click Update. It might take a while for the update to finish downloading and installing on your iPhone. Make sure that your iPhone stays connected to your Mac the entire time it is updating.