Before you even peel the plastic off your new iPhone 12 mini or iPhone 12 Pro Max, read this setup guide.

Congratulations! You’re now the proud owner of a new iPhone 12 mini, iPhone 12, iPhone 12 Pro, or iPhone 12 Pro Max. You probably want to dive right into the phone the moment you get the box in your hands, but try to contain your excitement and do a little prep first!
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https://www.macworld.com/article/3586735/new-iphone-12-setup-guide-tips-do-these-things-first.html