Apple's new iPhone 12 and iPhone 12 Mini are now official and feature a largely common feature set including the powerful A14 Bionic SoC, 5G connectivity, dual 12 MP cameras, and more. The iPhone 12 Mini with a 5.4-inch display is being touted as the world's smallest and lightest 5G phone
https://www.notebookcheck.net/Apple-iPhone-12-and-iPhone-12-Mini-sport-A14-Bionic-5G-and-a-US-30-surcharge-for-non-AT-T-and-Verizon-customers.497348.0.html
That does not look good this smells of price fixing and collusion amongst wireless carriers I imagine this might probably be investigated you can't do that and exclude another carrier. Just like apple and Verizon though especially to try to pull some shady stuff