How do I factory reset a iPhone 6s if I don’t have a computer or laptop??
How i factory reset my old iPhone 6s to give to my son??
iPhone 6s, iOS 14
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You don’t need a computer in order to erase the device completely in order to give it away or sell it. See the instructions in here.
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support