That doesn't seem to be the case when I've looked into the firmware updates. The reason they have different iPhones for ATT and Verizon is they are using completely different radio systems. The firmware updates aren't carrier specific or else the online jailbreaking guides (many include ipsw checksum) wouldn't work in different countries.
Since what CarrierIQ is doing is considered illegal in many countries I'm fairly sure Apple wouldn't want to open themselves up to that type of liability.
Since what CarrierIQ is doing is considered illegal in many countries I'm fairly sure Apple wouldn't want to open themselves up to that type of liability.