It can be a bit economical to do that for the US & Canada but once you start needing to regularly make calls in both NA and somewhere outside NA that's where it

It can be a bit economical to do that for the US & Canada but once you start needing to regularly make calls in both NA and somewhere outside NA that's where it really shines. There are some providers that cover all of NA for a reasonable price and most other geographies have really wide coverage - but there are scant choices for NA & Spain or NA & France coverage.