On either of the Pro models, it's $100 to go from 128GB to 256GB ... iPhone 11, and iPhone SE. You'll be able to get the new devices directly through Apple, or from any major carrier like AT&T ...
For AT&T and Verizon, it represents a huge leap forward in the 5G race. For their customers, it will mean the first time many of them will experience a significant difference between 4G and 5G.