Error 30004 occurs when a message cannot be delivered because the destination number is blocked, unavailable, unable to receive SMS, restricted by local regulations, or has previously opted out of messaging.

TABLE OF CONTENTS

What Is Error 30004?

Error 30004 means the destination number could not receive the message.

The cause may be related to the recipient’s device, mobile carrier, regulatory restrictions, or a previous opt-out request.


Key Benefits of Troubleshooting Error 30004

Identifying why the destination is blocked helps determine whether the issue can be corrected or whether messaging should stop for that recipient.

  • Faster Diagnosis: Determine whether the failure is caused by the device, carrier, opt-out status, or regulatory restrictions.

  • Better Compliance: Avoid messaging contacts who have opted out or are restricted from receiving certain messages.

  • Improved Deliverability: Identify carrier or destination-specific delivery problems.

  • Cleaner Contact Management: Prevent repeated sends to recipients who cannot or should not receive SMS.


Common Causes of Error 30004

Error 30004 may occur when:

  • The destination number is blocked from receiving the message.

  • The recipient’s device has weak or no signal.

  • The destination number cannot receive SMS.

  • The number belongs to a landline.

  • The destination number is listed on India’s national Do Not Call registry.

  • The recipient’s mobile carrier is experiencing a delivery issue.

  • A recipient previously replied with STOP or another supported opt-out keyword.

  • A message is being sent from a U.S. or Canadian toll-free number to a recipient who previously opted out.


How to Fix Error 30004

Start by reviewing the destination number and recent message history.

  1. Open the affected contact record.

  2. Confirm the destination number is correct.

  3. Verify that the number is capable of receiving SMS.

  4. Confirm the number is not a landline.

  5. Review the conversation history for previous opt-out keywords such as STOP.

  6. If the contact opted out, do not continue sending SMS unless they properly opt back in.

  7. If the recipient is in India, consider whether the number may be listed on the national Do Not Call registry.

  8. Retry only when the issue appears temporary and the recipient is eligible to receive messages.

  9. If failures continue, review whether they are isolated to one number or one carrier.


Check for Previous Opt-Out Requests

A recipient who has opted out should not continue receiving SMS.

Review the conversation history for replies such as:

  • STOP

  • CANCEL

  • END

  • UNSUBSCRIBE

If the recipient previously opted out, respect that preference and do not continue sending messages until they complete the appropriate opt-in process.

This is especially important when using U.S. or Canadian toll-free numbers.


Messages Sent to India

Error 30004 may occur for messages sent to India when the destination number is listed on the country’s national Do Not Call registry.

If the recipient is in India:

  • Confirm the number is formatted correctly.

  • Confirm the number is mobile-capable.

  • Review whether the destination may be restricted by national DNC rules.

  • Avoid repeated retries if the message continues to fail.


Check Device and Carrier Availability

The recipient’s device may also be temporarily unable to receive SMS.

Verify that:

  • The device is powered on.

  • The device has sufficient signal.

  • The recipient’s mobile service is active.

  • The carrier is not experiencing a temporary issue.

  • The recipient can receive SMS from other senders.

If the issue is temporary, retrying later may succeed.


Check Workflows and Campaigns

If Error 30004 appears during automated messaging, review whether the contact should still be receiving messages.

Check:

  • Contact opt-out status

  • Workflow enrollment

  • Campaign recipient lists

  • Toll-free sending number

  • Contact phone number type

  • Repeated delivery failures

Remove or suppress recipients who have opted out or who cannot receive SMS.


Frequently Asked Questions

Q: What does Error 30004 mean?
It means the destination number could not receive the message because it was blocked, unavailable, restricted, or otherwise unable to accept SMS.

Q: Can an opt-out cause Error 30004?
Yes. A recipient who previously replied with STOP or another supported opt-out keyword may be blocked from receiving future messages.

Q: Can a landline cause Error 30004?
Yes. If the destination number cannot receive SMS, the message may fail.

Q: Can this error occur when messaging recipients in India?
Yes. A number listed on India’s national Do Not Call registry may produce this error.

Q: Should I keep retrying the message?
Not if the recipient opted out or is subject to a known restriction. Retry only when the issue appears temporary and the recipient is eligible to receive SMS.

Q: Can a mobile carrier cause Error 30004?
Yes. Temporary carrier issues can prevent a message from reaching the destination.

Need Help?

If Error 30004 continues, first determine whether the issue is related to the recipient’s device, number type, carrier, opt-out status, or regional restrictions.

Verify that:

  • The destination number is correct.

  • The number is capable of receiving SMS.

  • The number is not a landline.

  • The recipient has not previously opted out.

  • The contact’s messaging status allows SMS.

  • The destination device has sufficient signal.

  • The recipient’s mobile service is active.

  • The destination is not affected by a regulatory restriction.

  • India-based recipients are not blocked by national Do Not Call restrictions.

  • Automated workflows or campaigns are not continuing to send to opted-out contacts.

  • Repeated failures are not limited to one carrier or one destination.

If the recipient has opted out, do not continue sending messages until they have properly opted back in.

If the issue continues, collect at least three failed message examples from the last 24 hours, including the sending number, destination number, timestamps, recipient carrier if known, opt-out status, and screenshots showing Error 30004 before contacting support.