There is a coverage map for Visible. It should be close to the same coverage. Only difference, from my understanding, would be in an area where there is domestic roaming, Visible doesn't have the same roaming agreements as Verizon does even though they own Visible. So it is possible to hit an area that has no Verizon towers and since they have an agreement with the other two carriers a person on Visible may not have a signal but a person on Verizon will. I think these areas are far and few since I don't see much mention of it.
