This is confirmed. I was able to use a Verizon Iphone on At&t and get unlimited data for $10. At&t has data unlimited for feature phones starting at $10. Since you use a Verizon iphone, at&t doesn't recognize it as a smartphone and you get billed at $10. Only downside is you don't get LTE. It's HSDPA+ which is not bad at all. I got speeds upto 7Mbps down. It's been 5 days and the At&t system still shows my phone as a "feature" phone when I have been using my Verizon iphone all throughout.