Just got my phone. i wish Apple was more clear on requirements and whats needed when transferring devices. i had sold my old phone 2 days ago fyi. i backed it up and thought i was prepared for an easy process.
At the apple store today i attempted a restore of my icloud to the new phone. First roadblock was that it required 2 factor authentication to set up the phone. I didn't have my old phone, and don't have a computer or device that could authenticate. The option was a text and that was it. No one at apple could help, and they suggested I call Apple tech support. They let me use a phone and I called them. This was a joke. The gal on the phone didn't truly understand the issue, and kept suggesting I just pop my old sim into the new phone. I kindly suggested back to her that wasn't an option on the 14 and had to inform her no physical sim tray existed.
I left Apple a bit flustered, and headed to Verizon. This is where I hit another roadblock. They were happy to help transfer my SIM to an eSIM in store but had to verify my account by texting me. I explained I didn't have a phone to do this and they wouldn't allow me to put my physical sim into a device there to get the text for security reasons. They did suggest to send the verification text to someone else on my plan, and this worked and they were able to successfully transfer to eSIM. From there it was fairly normal and my phone continued the transfer.
I am not sure if I was in an extreme minority of customers that don't have the old device to get through these 2FA things, but glad it worked in the end. I just think Apple, and carriers should be more direct with customers upgrading to any phone from a physical to eSIM to make it easier.