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Message blocked

ERROR: 30004

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Message Delivery - Message blocked

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Possible Causes

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The first step to troubleshooting this issue is to attempt to replicate the problem. Attempt to send another test message to this user via a REST API request or through the API Explorer in the Twilio Console(link takes you to an external page).

If you see similar results, continue troubleshooting with the following checklist:

  • Is the destination device powered on?
  • Does the device have sufficient signal? If not, power the device off, then wait 30 seconds and then power it back up.
  • Is the device connected to the home carrier's network? We cannot guarantee message delivery to devices roaming off-network.
  • Can the device receive non-Twilio SMS?
  • Can the device receive messages from another Twilio number (not using an Alphanumeric Sender ID(link takes you to an external page) ), or with a shorter one-segment (non- concatenated(link takes you to an external page) ) body?
  • Can other devices using the same mobile carrier receive your messages?

If you can rule out all of the above issues, continue troubleshooting below.

"Undelivered" messages sent to India

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Error 30004 results on undelivered messages sent to India could be due to the destination number being listed on the national Do Not Call (DNC) registry.

For more information on sending messages to India, including links for updating DNC settings, please see our help center article on limitations for sending SMS to India(link takes you to an external page).

Repeated messages with a Failed status and error 30004 results indicate Twilio may be filtering some of your messages internally.

This filtering is in place to help protect our customers, and the rules attempt to match what we have observed from the industry. For more details, including potential workarounds, please see our help center article "How Does Carrier Filtering Work?"(link takes you to an external page)

Continued issues with error 30004

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Twilio's support team can help investigate what went wrong with delivering your message. Please collect 3 or more message SIDs in your SMS logs(link takes you to an external page) from the last 24 hours that were flagged with Error 30004, and open a support request(link takes you to an external page).

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