1.  calling card(n = noun.possession) phone card - a card that is used instead of cash to make telephone calls;
is a kind of charge card, charge plate, credit card, plastic

2.  calling card(n = noun.communication) card, visiting card - a printed or written greeting that is left to indicate that you have visited;
is a kind of greeting, salutation

3.  calling card(n = noun.cognition) - a distinguishing characteristic or behavior; "bombs are a terrorist's calling cards"
is a kind of distinctive feature, distinguishing characteristic, peculiarity

bank card, baseball card, birthday card, boarding card, borrower's card, business card, calling, calling into question, calling together, card, card carrier, card carrying, card catalog, card catalogue, card game, card index, card player, card shark, card sharp, card sharper, card table, card trick, cash card, charge card, christmas card, circuit card, compass card, court card, credit card, debit card, donor card, drawing card, easter card, face card, filing card, flash card, gaming card, get-well card, green card, greeting card, hole card, hollerith card, id card, identity card, library card, mass card, membership card, name calling, phone card, picture card, playing card, post card, postal card, punch card, punched card, ration card, report card, sea card, show card, smart card, sympathy card, tarot card, three-way calling, trading card, trump card, union card, visiting card, wild card