^ I've been to three different Apples stores around my neck of the woods and at all places, iPhones I saw were showing full 5 bars. It wouldn't surprise me if they are all running AT&T 3G Microcell in the US stores, though. FWIW, I was able to make calls just fine (2 bars at most) from my friend's house with iPhone 4, where the said friend can barely make calls with his original iPhone or with his wife's iPhone 3. FYI, they already had iPhone when they bought their house (i.e., they didn't buy iPhone knowing their house has crappy AT&T service).