Old Phone erase
Why am I asked to sign out of my Apple ID when trying to completely erase old phone and if I do that and completely erase my old phone will it effect my new phone?
iPhone 6s
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You shouldn't manually delete your contacts, calendars, reminders, documents, photos, or any other iCloud information while you're signed in to iCloud with your Apple ID. This would delete your content from the iCloud servers and any of your devices signed in to iCloud.
What to do before you sell, give away, or trade-in your iPhone, iPad, or iPod touch - Apple Support