That was because Apple obtained an adjudication_from_the_UK's_Advertising_Standards_Authority that Samsung cannot claim their Galaxy S II (thickness 8.71mm) to be the "slimmest smartphone in the world" and that the iPhone 4 (thickness 9.3mm) should have that exclusive honor as the Galaxy S II has a bulge at the camera that reaches 9.91mm !!!
So, the iPhone 4 Remained_The_Thinnest_Phone_In_The_World and kept being lauded for it..
You're not going to let such a great record be marred by a tiny protrusion now, are you? You're just looking at it wrong..
iPhones are best!.. Just ask Apple!