On Sun, 20 Aug 2017 23:00:28 +0100, "James Wilkinson Sword"
wrote:

So if I call an American landline, I might get an unexpectedly large phonebill because it's actually a mobile?

Why would you get a bill?If you have a landline you do not pay
minutes, and most mobile people have unlimited plans these days too
unless it is a "burner".