This article is from the Bulgaria FAQ, by Dragomir R. Radev firstname.lastname@example.org with numerous contributions by others.
(by Plamen Stefanov), last updated: 03-Jan-1997
Public phones are plentiful but require coins, which
you deposit at the top of the phone after dialing the number.
Stockpile a few of these coins, since they are rare, and venders
eschew dispensing change to foreigners. ...