What kind of cell phone plan is good for US Cellular?

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Hey whats a good cell phone plan for US cellular all I really want for is to call a few friends and most of them have US Cellualar and I thought that mabye I would get that mobile to mobile thing. How doe sit work exactly I know that you can make as many calls as you want to some one with US cellualar and not be chartged extra for it, but even if you tlak for like an hour? Or is there some kind of limit to it.