The 928's made to run on Verizon's network, so you'll find support for LTE / CDMA, but there are also radios for HSPA+ making it "global ready."
Interestingly, Nokia's using the same PureMotion HD+ screen tech in the 928, so the big difference between the 928 and the 920 is the brightness and vividness of its 4.5-inch, Gorilla Glass 2-coated window to WP8. That's because of the OLED display. The 928 offers excellent viewing angles.
