I want to update my phone

Assuming a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support

10k224 Said:

"I want to update my phone: ho can I update my iPhone"

-------

Why the Error?: There is an issue connecting to Apple's servers.

To Check for Updates:

Use a Computer and Ethernet:

Start with attempting an update through use of a computer. If you cannot use Wi-Fi, then use Ethernet.  Go Here: Update your iPhone Using a Computer - User Tip. 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. If you get the same error, the model is likely just not compatible.