Why does it keep saying error when trying to download update

2674h Said:

"My phone is plugged in I’ve cleared space for it on my storage, and it still won’t update."

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Why the Error? there is an error connecting to Apple's update servers..

Update Using a Computer and Ethernet:

Try updating via a computer. Go Here: Update your iPhone Using a Computer - User Tip.

Using Ethernet:

If you cannot use Wi-Fi, then use Ethernet. On the computer, you would connect it through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple

2674h Said:

"I don’t have a computer and I am on wifi."

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Updating:

Ask someone if you may use their computer or their network. Or go to a Public LAN such as a library.