lost all my photos and some contacts
I have an iPhone 8 Plus that I gave to my boyfriend and we figured that just erasing all the content and pictures would wipe it clean for him to use but when we took my SIM card out and put his in it seemed ok until a few hours later and all my photos were gone in my new iPhone 12 and some contacts. what can I do to get my phone back to normal and how do I get my iPhone 8 Plus wiped clean and ready for me to give away?
iPhone 12 Pro, iOS 14