How do I update my iPhone?
I want to upgrade my phone
[Re-Titled by Moderator]
iPhone XR
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If you mean update the system software, these articles outline two ways of making sure your device is running the newest version possible:
Update your iPhone, iPad, or iPod touch wirelessly. Click here --> Update your iPhone or iPad - Apple Support
Update your iPhone, iPad, or iPod touch with the Finder on a Mac computer --> Update your iPhone, iPad, or iPod touch with the Finder - Apple Support
If you really do mean upgrade the iPhone, the only way to do that is to buy a newer iPhone. No hardware modifications are possible.