CSpire- local network these phones were on is cdma BUT quick googlefu yields this info about the phones.....
“The iPhone 7, 8, X, XS, and XR are a bit different. There are two versions of each phone: The Verizon and Sprint variants have CDMA and GSM chips on the inside, and can be taken to any other carrier as long as the phone is unlocked. The AT&T and T-Mobile variants, however, only come with a GSM chip”
So it seems they each have both gsm and cdma chips.
I will contact each of the 1st three replies I see listed under my thread. Phones will go to them.
Will email y’all each here in a few.