I have ESIM, but I moved from an iPhone 12 Pro on credits to an iPhone 13 Pro. Bought the 13 Pro from Apple and did the ESIM transfer from my 12 to the new 13.
I traded in the 12 Pro at Apple for the 13 Pro and paid in full the 13 Pro balance, so I owe nothing on the 13 Pro.
I did this back in Nov '21 and I am still getting my monthly credits on my 12 Pro (from trading in my 11 Pro).
And just to confirm, I am on AT&T
Hope that makes sense.
It does. Excellent - thank you