Goodcall is the only vendor in this comparison that does not meter talk time. Its own FAQ is blunt about it: "We DO NOT charge any fees for number of calls, call minutes, or tokens." What it counts instead is unique customers a month, meaning callers with distinct phone numbers, and by its own definition a client who rings ten or more times in a month still counts as one.
It is priced per agent rather than per account, and each plan separately caps how many team members can use it. It is available in the United States only, which the vendor states plainly rather than leaving to inference.