I have been told that in order to use a particular phone with my service through U.S.Cellular, that I have to buy a phone with their software in it...and I have also been told that I can use any ol' cell phone, provided I put the "sim card?" from my phone in it.............AND I have also been told that U.S.Cellular phones don't have removable "sim cards", so obviously I am a little confused and a lot uneducated.

I need a "new" phone, would prefer something like my old Razor V3M, but think the prices at Us Cellular are crazy...am thinking the used market is where I'm headed, but am seeking advice/info.