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The alternative billing method (and what is commonly referred to as a mobile phone contract) is the postpaid mobile phone, where a user enters into a long-term (generally lasting 12, 18, or 24 months) or short-term (also commonly referred to as a rolling contract or a 30-day contract) billing arrangement with a mobile network operator or carriage service provider (CSP)

Resource: https://en.wikipedia.org/wiki/Prepaid_mobile_phone