4.2.1 is indeed the largest piece (exactly 50%) of my users that are on iOS less than 4.3, with other versions sprinkled in. And as it happens, looking by devi

4.2.1 is indeed the largest piece (exactly 50%) of my users that are on iOS less than 4.3, with other versions sprinkled in. And as it happens, looking by device, 87% of my <4.3 users are on 3G devices.