The most convenient and fastest way to update iPhone to iOS 16.3 is through the device itself.
- Open the “Settings” app on your iPhone and select the “General” menu item.
- Now tap “Software Update” to make iPhone check for existing updates.
- If a new version is available, click the “Download and Install” button below.
- Once the update is downloaded, you will then receive a message stating that your iPhone will restart in a few seconds. Installation may now take some time. It’s normal for the loading bar and the Apple logo to appear multiple times.
Alternatively and if there are any issues with the update on the device, the iPhone can be updated on the PC or Mac.