You definetly need an internet package if you're not within wifi range. Either continue to pay for the g1 package or you can try getting tzones. It's way cheaper, you'll get the same speeds but it may take a little convincing since tzones is a granfathered plan. You can't simply go and add it online anymore.
You can read about it here: http://www.modmyi.com/forums/t-mobil...ml#post3304241