re:
Yes you could, but you could not get LTE. The chipset also handles GSM. You'd pop out the SIM and use an AT%T sim. Apparently, Verizon has unlocked this. For example, you can also do this with an iPhone5 from Verizon. You could get fast HSPA+ internet, but not nearly as fast as LTE. If you want to use ATT just get an HTC 8x there and you'd get LTE.