If I were to buy the new AT&T compatible version of the Nexus One and insert my own SIM card (I am currently on a shared plan, if that matters), would the $30/month plan be my only choice for unlimited data, or would I be able to choose a cheaper unlimited plan, like that of a feature phone, which is I believe only 10 or 15 per month on att? I don't know much about unlocked phones so I wanted to make sure about the data plan before making the $529 purchase. So basically, with an unlocked att Nexus One, if I want unlimited data, would I be stuck with the $30/month smartphone plan or could I purchase $15/month feature phone plan? I would think that since it is unlocked, I could (should) have the freedom to choose either plan, but I am not sure. Thanks for any help.