Hey rrossllynn,
It sounds like you're having trouble updating your iPhone because of this error message. Take a look at the steps here as they have some of the best solutions to resolve update issues: If your iPhone, iPad or iPod touch won’t update - Apple Support. If you're still having trouble updating, then try updating using a computer. Take a look under the section "Update your device using your computer" here: Update your iPhone, iPad, or iPod touch
Have a great day.