"The world phone is a big thing, especially for a lot of users who travel internationally," Burden said.

Both Gartenberg and Burden noted that Apple benefits from having both GSM and CDMA inside the iPhone 4S, because it can simplify future updates to one model. "You will have one phone for multiple carriers," Burden said.

Apple boasted that the iPhone 4S supports download speeds of up to 14.4Mbps with HSDPA (High Speed Download Packet Access) technology. Burden said that capability will work on many GSM networks globally, including AT&T's in the U.S.