iphone hack questions

I am a new iphone user which I purchased off ebay and have unlocked and functioning off AT&T's new $60 unlimited talk & text plan, which is great!

However, what I'm trying to find out is if there is a way to either do one of the following:

1) Hack the phone so that I can use data unlimited anywhere without having to pay for it?

or

2) How long would it take for the iphone to burn up through the prepaid 100MB for $19.99?


By the way I have heard rumours that you can hack an iPhone to use the ancient IDEN Boost Network. Does anyone know anything about that?