I will follow-up with Apple again, but I have yet to see a confirmation from someone who is actually using the iPhone SE 2020 with public mobile's network.
I typed in "iphone se 2020" (no quotes) in the search above and found lots of results.
The phone will work.
Can you call the previous provider it was on?
Can you connect via usb and run itunes and see if something will update? All this Apple stuff is murky for me though 🙂
I have an iphone SE 2020 A2275 and it works fine. You will need to go to "unlockit.co.nz" to set up APN though.