After you inhale that new-iPhone smell, follow this setup guide to be up and running faster than you can say A11 Bionic.

Did you just get a shiny new iPhone 8 or 8 Plus. Nice! Before you head out to take a squillion photos or plop it down on your new wireless charging pad, there are a few housekeeping details you should tend to first.
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https://www.macworld.com/article/3227547/iphone-8-and-8-plus-setup-guide.html