On an average commute (the times where you really get to see what phones everybody are using), I'd say anywhere from a third to half of the phones I see people with are iPhones. It's certainly not a failure here, though if it were to be, it wouldn't be the RFID payment thing (which most people don't use because it's damn near impossible to figure out unless you're the sort of person that regularly posts to Slashdot). It would be because it can't handle websites aimed at Japanese phones, by which I mean the vast majority of websites accessed via a QR code printed somewhere which actually go as far as to completely block access to all but regular phone browsers. These sites are a valuable source of games (very bad ones), discount coupons, postage stamp sized pictures of celebrities that you get to set as your background screen for free, and other such wonders which are fantastically important to the phone buying market.