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Two-Factor Authentication (2FA)
Phone-based 2FA systems often rely on accurate phone number formatting to deliver SMS or voice codes reliably. A phone number library ensures the number is properly formatted for the SMS gateway.

3. CRM and Marketing Tools
Marketing platforms use these libraries to standardize and phone number library format phone numbers for SMS marketing, making sure messages reach the correct recipients globally.

4. Fraud Prevention
Telecom fraud often involves using invalid or spoofed phone numbers. Libraries can help detect such patterns and flag suspicious activity.

5. Localization
By detecting the region of a phone number, apps can provide localized content, currency, and services. For example, a user with a French phone number might see French-language content by default.

Popular Phone Number Libraries 1. libphonenumber
Created by Google, libphonenumber is the most widely used phone number library. It supports parsing, formatting, and validating international phone numbers and is regularly updated to reflect changes in numbering plans.