"US Cellular is, in my experience, the most-reliable."4.0 starson by nickjw
Pros: Rarely (if ever) do I have a dropped or missed call. I can't remember the last time I looked at my phone and didn't have service. By far the most-reliable mobile phone service I have experienced.
Cons: US Cellular doesn't tend to have the latest and greatest phones (I was told by a sales-person that this is because they test their phones rigorously before deciding to support them...don't know if this is true or not).
Summary: If you want reliable service, and phone service availability is most-important, US Cellular is the way to go.