Is there any substantial difference? In reviewing coverage maps, voice coverage appears to be the same, while data coverage is drastically different, since they do not allow data roaming (or at least it isn't covered) with the pre-paid plan. Other than that, the only difference I see is that with a traditional post-paid plan, you are given a grace period if your bill goes past due, while with pre-paid they just cut off your service until you refill your account.