Pitcairn, 1998

Famous for the affair of the mutineers of the Bounty, the island of Pitcairn is currently inhabited only by about fifty people, all descendants of the few who decided to remain on the island when the entire colony founded by Fletcher Christian (186 people) moved on the most welcoming island of Norfolk.
The only issue of phone cards was a series of 4 magnetic stripe cards comprising four values: $ 5, $ 10, $ 20 and $ 50. 1,000 of them were produced, except for the lowest value, printed in 2,000 copies. The cards, made locally, could be used not only to make calls, but also to send faxes.
There has been much discussion about the authenticity of these cards, but it has been confirmed that they are securely real and functioning phone cards. The issue was designed for the collector market, which with stamps is the main source of income for the population, and therefore the cards should never have been used in theory. However, a phone that worked with these cards was installed at the Adamstown post office, and it is therefore possible that some cards were actually used.