If a message sent via MessageBird's SMS service is not delivered, there could be several reasons for this. Here are some common factors that may cause message delivery issues:

  1. Invalid or Inactive Number: The recipient's phone number might be invalid or inactive. Ensure that the phone number is correctly formatted, and the recipient's phone is active and capable of receiving SMS messages.

  2. Carrier Filtering: Some mobile carriers implement filtering mechanisms to prevent the delivery of certain messages, especially if they consider the content as spam or if the sender has a history of sending unsolicited messages.

  3. Do-Not-Disturb (DND): The recipient may have activated the "Do Not Disturb" feature on their phone, which blocks incoming SMS messages.

  4. Number Portability: If the recipient has recently changed their mobile carrier while keeping the same phone number, there might be a delay in message delivery due to number portability processes.

  5. Message Content Violation: The content of the message might be flagged as inappropriate or violating the carrier's policies, leading to message blocking.

  6. Network Issues: Temporary network issues or congestion can lead to message delivery delays or failures.

  7. Balance or Credit: Ensure that your MessageBird account has enough credit or balance to send SMS messages. Insufficient credit might result in message delivery failures.

To troubleshoot the issue:

  • Double-check the phone number to ensure it is correct and active.
  • Verify the message content to make sure it complies with carrier and service provider policies.
  • Check your MessageBird account balance to ensure you have sufficient credit to send messages.
  • Contact MessageBird's support team for assistance in investigating the specific reason for the message delivery issue.

If the problem persists, reaching out to MessageBird's support will be the best way to get help in resolving the issue. They can investigate further and provide specific guidance based on your account and message details.

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