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Kindly turn on and view Amazon CloudWatch Logs for your SMS messages. To know more about why SMS messages are not sending through Amazon Simple Notification Service (Amazon SNS), Kindly refer the below knowledge center article.
[+] How do I troubleshoot mobile text message (SMS) failures in Amazon SNS?
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asked 3 years ago
asked 2 years ago

Did you verify the status of the message? Most of the time is the carrier that detects it as spam and blocks it before reaching your phone.