alt Hacker NewsThere are cheaper and less risky ways to understand if a number is valid. STOP will legitimately unsubscribe the recipient from messages from this phone number.
There are cheaper and less risky ways to understand if a number is valid. STOP will legitimately unsubscribe the recipient from messages from this phone number.
There aren’t more reliable ways to know if the number is valid and actively used. Relying means that number will receive spam from many other numbers later.