Which telemarketing scam relies on use of a certain area code to make money just from phone calls?

Name: Which telemarketing scam relies on use of a certain area code to make money just from phone calls?
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Question

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900 calls are a type of telemarketing scam where the caller convinces the victim to call a number with a 900 area code, resulting in high charges for each minute of the call. The scammer earns money from these charges without providing any actual service or product.

Which Telemarketing Scam Relies on Use of a Certain Area