I currently have a T-Mobile G1. I am not sure if I want to jump the gun and get this device, but it sure looks amazing with the specs. I have heard that it will work with T-Mobile 3G bands if I get the phone unlocked. Can I stay with the current G1 Data Plan or is there a different plan that I would get? Will my current SIM card be able to used in the device? If I were to get the device and not to like it, is there a refund thing that I can do? Thank you for your time.