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In page Advance-fee scam:

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A contemporary (mid-2011) innovation is the use of a Premium Rate 'call back' number (instead of a website or email) in the SMS. On calling the number, the victim is first reassured that 'they are a winner' and then subjected to a long series of instructions on how to collect their 'winnings'. During the message, there will be frequent instructions to 'ring back in the event of problems'. The call is always 'cut off' just before the victim has the chance to note all the details. Some victims call back multiple times in an effort to collect all the details. The scammer thus makes their money out of the fees charged for the calls.[citation needed]