Pay-As-You-GoA type of mobile phone service subscription which allows cellphone owners to pay in advance for talk time, and add add more airtime as needed, by day, week or month. Pay-as-you-go services require no contract, and often no sign-up fees other than mobile phone service hook-up. Usually airtime is purchased in the form of a calling card where the user inputs a code from the calling card to use the purchased airtime minutes. Also called a pre-paid service.
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