Apple ID erase
I just got an iPhone 11 and I’m using the same iCloud as my iPhone 8 and I want to reset my iPhone 8 so I can hand it down but I’m afraid if I reset it , it will do the same to my iPhone 11 ?
iPhone 11
You can do all of the steps in the following on your old phone and it will not do anything to your new one: What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support