Must-do before sending an international SMS: How to avoid invalid numbers using an international unused number detection service?

This made me realize that the first step in WhatsApp's number screening process is not format calibration, but rather having a scientific verification system.

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Both self-screening and proxy-screening modes provide operations teams with flexible options for efficient batch account management.The system supports the generation and filtering of international mobile phone numbers, integrating account activity to achieve targeted global marketing and user resource integration.