Ios Update Download Over Cellular. Set Month three months ahead (right now that would be from October to December) Go back to General. Tap on your phone number under the heading of Cellular Plans.
Otherwise the iPhone will get bricked, requiring a DFU restore erasing all data.
Hence, you may want to disable this limit so that you can download huge apps, especially games onto your devices over cellular.
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How to Stop Automatically Downloading iOS & iPadOS Updates to iPhone & iPad
Apple did not allow downloading large iOS updates through cellular/mobile data for a long time. You have to go back into the Date & Time preferences and toggle back ON Set Automatically otherwise it will fail to install the update. If you see more than one software update option available, choose the one that you want to install.