While not strictly fraud blocking or heavily

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Combatting Account Takeover (ATO) and SIM Swap Fraud:

Scenario: In SIM swap fraud, fraudsters port a legitimate user's number to a SIM they control. While carrier lookup is critical here, the initial account setup might involve numbers from unexpected country codes.
Fraud Indicator: If a user with a historical profile tied to one country (verified by their "phone number country code") suddenly tries to authenticate or change details with a number from a completely different country code, it should raise a red flag.
Reducing Spam and Unsolicited Communication:

Scenario: Businesses often receive spam inquiries or dataset unwanted registrations from specific international country codes.
Fraud Indicator: scrutinizing interactions originating from known spam-source "phone number country codes" can improve operational efficiency and reduce resource drain from malicious or unwanted traffic.
It's important to note that a "phone number country code" analysis is just one data point in a comprehensive fraud detection system. It should be used in conjunction with other signals, such as IP address, device fingerprinting, behavioral analytics, and carrier lookups, to build a more robust and accurate risk profile. Nevertheless, this seemingly simple numerical prefix offers a quick and effective initial screening layer that can significantly bolster a business's defenses against fraudulent activities.

Page 5: Cost Optimization and "Phone Number Country Code": A Telecommunications Perspective
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For telecommunications companies, call centers, and businesses engaged in high-volume international communication, the "phone number country code" is not just a routing identifier; it's a critical factor in cost optimization. International calling and SMS termination rates vary dramatically based on the destination country and even the specific carrier within that country. Accurately identifying the "phone number country code" allows for intelligent routing decisions that can significantly reduce operational expenses.