English version

top-up card

From Longman Dictionary of Contemporary Englishtop-up cardˈtop-up ˌcard noun [countable]  a card that you buy in order to be able to continue using a pay-as-you-go mobile phoneFrom Longman Business Dictionarytop-up cardˈtop-up card a small card or piece of paper you can buy which increases the amount of time that you have for making calls with your mobile phone card
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