Quick question... I currently have the original Motorola Droid with Verizon, of course. I am really liking what I have read about the Samsung Epic 4G, and want one a lot, which is with Sprint. So... I will have to switch to Sprint. I don't want my Droid to be just a paperweight, though, but I don't want to pay for two carriers. I have never owned a phone without a carrier. How does that work? Can I still use it fully over wifi? What about calls? Would I still be able to do even that using Google Voice or something else? As much info you can provide would be much appreciated. Thanks!