Can I update iPhone without Wi-Fi

If you have an iPhone 12, 13, 14 or SE 3rd generation with a 5G cellular plan and are on a 5G network, you can update over cellular.

Click on this link for instructions on how to update your phone over a 5G cellular connection.

https://www.macrumors.com/2020/10/21/iphone-12-can-download-ios-updates-over-5g/

Update using your computer -

Click on this link for instructions on how to update your phone using a computer

Update iOS on iPhone - Apple Support