How can I do a software update on my iPhone?

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

tamanda148 Said:

"How can I do a software update on my iPhone?: what instructions can you give me to update my software on my iPhone?"

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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.