Hello, I just received my new iPhone 13 and I followed the transfer to new device process. Once completed my old phone gave me an option to delete everything on the old phone in menu.I followed the directions and my old phone show the greeting for a

Hello, I just received my new iPhone 13 and I followed the transfer to the new device process. Once completed my old phone gave me an option to delete everything on the old phone in the menu. I followed the directions and my old phone now shows the greeting for a new owner startup.

How can I be sure all my data was removed and I was signed out of my services on the old phone.