I grew up BBSing in Southern NH where you could not make a free call from Manchester to Nashua or Concord but it was a free call to towns in between those cities like Hooksett or Derry and a free call from those towns to adjoining cities.

One cheat we developed was a script that would make the BBS hang up, program the call forwarding, wait for a ring, then remove call forwarding. This way the caller could call a local BBS, choose a BBS in a distant city, hang up, dial again, then reach the second BBS.

It never really caught on for a few practical reasons, one was that somebody else could dial the first BBS when call forwarding was active and end up reaching the wrong BBS.