5 times it makes sense to use a prepaid carrier like Mint or Visible
MVNOs have a lot to offer

A prepaid carrier like Visible or Mint Mobile offers an alternative to big carriers like AT&T, Verizon, and T-Mobile. The biggest difference is that these Mobile Virtual Network Operators (MVNOs) exclusively offer prepaid plans, but many more factors set MVNOs apart from bigger carriers. Even if you already have a prepaid phone plan, MVNOs can offer excellent deals on hardware you can't find anywhere else.