UPDATED Ok... I just got the T-Mobile Pre-Paid "Free Data for Life" plan. Basically, you get 200MB of data for free, and you can pre-pay for more, if you need it, buy by the day, week or month, at any time. Check with T-Mo for rates. Yes, I know that T-Mo has a smaller footprint, but it still bigger then the one I have have now, which is strictly limited to Wi-Fi! But if you need/use less then 200 MB, again, that is free! Now, I know that is pretty much just text email, but it works for me because I only want mobile data when I need it. It looks like the Pre-paid data runs about $10/GB, or less. The required SIM card is $20, but right now IT IS FREE. They say that it will work with my MC7700 Sierra Wireless Airprime card (GOBI 4000), as long as it is not carrier locked. From what I understand, none of the MC7700 were carrier locked. Mine was not. I hope that this info is helpful to someone, the last time I tried to start a thread about cheap data, it did not get much response. I do not work for T-Mo, nor was I customer until tonight. If you know of a cheaper plan, I am all ears! But this plan works well for me!