erasing content from old phone
How do I erase content from my old phone before sending it back to apple
iPhone X
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What to do before you sell, give away, or trade in your iPhone, iPad, or iPod ...
Remove your personal information from your old device. If you paired an Apple Watch with your iPhone, unpair your Apple Watch. Back up your device. Sign out of iCloud and the iTunes & App Store. Go back to Settings and tap General > Reset > Erase All Content and Settings.