Changing ID on a Iphone
Want to give my wife my old Iphone - not sure if I need to totally Erase it to change it so I can establish a separate ID account for her?
iPhone SE
You don't have to completely erase the phone using the steps in the article below, but doing the steps in the article below makes it 'her' phone. Unless she needs your data, erasing the phone is the best thing to do.