I recently added a new line to my account that came with a free new iPhone. I would like to use the new iPhone on a different existing line and swap an existing (older) iPhone to the new line.
I'm unsure how to go about this. The Swap device function seems to require that both devices be set up. However, since the new device is on a new, not yet activated, line, it doesn't show up as an option to swap.
When the new device arrives can I upgrade my current active line to that device, erase everything on the current older phone, and then use it to set up the new line?
Or, with eSim cards, is the new line tied to the new device?