Taking off everything from old phone
I currently have the iPhone Xs with all my information on it. I am trying to wipe out my old iPhone 6s plus . They are both connected through iCloud, so I was wondering if I factory wipe my old phone, will it take everything off my current one? Or do I still need to back up my old phone before wiping even though the current one I am using has everything on it and more.
iPhone 6s Plus