Wipe old phone
I was given someone else phone. I’ve moved over to the new phone, but have not wiped the old one. My iCloud is full and I can’t back it up. Will wiping the old phone only erect the I go on it?
iPhone SE, 13
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. If you're using iOS 10.3 or later, tap Settings > [your name].
What to do before you sell, give away, or trade in your iPhone ...