I'm doing some iPhone development and let's just say developing to run on the 3G is starting to feel like developing for Internet Explorer. IMO it's an outdated model. I'm trying to convince my client that the amount of effort I'm putting into supporting the 3G is not worth the time. I would be able to make a stronger case if I had some concrete numbers to show just how many potential 3G iPhone customers there are vs the more recent models. Does anybody know where I can find this info?