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Hittade detta på macrumors.com
"When we looked at 3G, the chipsets are not quite mature, in the sense that they're not low-enough power for what we were looking for. They were not integrated enough, so they took up too much physical space. We cared a lot about battery life and we cared a lot about physical size. Down the road, I'm sure some of those tradeoffs will become more favorable towards 3G but as of now we think we made a pretty good doggone decision."
Anandtech disects a Samsung Blackjack as well as the iPhone to compare chipset sizes for 3G vs EDGE implementations and concludes that indeed the "iPhone would have to be a bit thicker, wider or longer to accommodate the same 3G UMTS interface that Samsung used in its Blackjack".
Alltså skulle iPhone vara större med 3G (thicker, wider or longer).