From Longman Dictionary of Contemporary Englishphonecardphone‧card /ˈfəʊnkɑːd $ ˈfoʊnkɑːrd/ noun [countable] TCTa plastic card that can be used in some public telephones instead of money
Examples from the Corpus
phonecard• Have plenty of coins, a phonecard and pen and paper at the ready when you begin your telephone search. 7. 