I know there are some posts on this topic but I did not really saw anybody doing this, at least no mention of this plan ! This is for ppl who don't really use any minutes and mostly data on their iPhones. Okay this is what I wanted to check. 1. Buy an iPad 3G with unlimited data plan.[I think now there is no option for unlimited data plan for iPad] 2. Cancel your iPhone contract (3GS or lower). Not very expensive if you had the old contract. OR buy iPhone 4 for full price without contract. 3. Put your iPad 3G sim in your iPhone and use iPhone as iPod touch with iPad's 3G data plan from ATT. I never really thought about it but realized recently that since I use my iPhone primarily for Data if I can do this this will be awesome!!! I can even use skype or fring and make calls too! Let me know if anyone has done this OR there are any flaws in my story! Note: If you still want to maintain your Phone number, just switch to some dumbphone plan with no data (even pay as you go). Cheapest family plan will work too!! (Agree that then you will pay for Voice too). Let me know if I am missing something.