I'm looking to pick up something for occassional use. I've had cells before (used to work for Nextel), but I never used them. I'm looking for something I can get to just throw in the car for road trips and what not, so I don''t really want a 1-3 year contract. It looks like I will end up with Virgin Mobile, as it has better service here than other carriers (northwest MI). I'm looking at the Oystr and the Slice phones, but I've never had any experince w/ the pre-pay stuff. Anything i should know or look for?