1981-1987[]
In 1981 BT introduced Phonecards which allowed users to pay for telephone calls at telephone boxes with credit stored on pre-paid cards.
1987-1991[]
1991-2004[]
Phonecards were withdrawn from sale in 2002 though continued in use until 2004 in non-public situations.
1995-1996[]
Used during trials for a new version of the Phonecard from 1995 until 1996.