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SMS troubleshooting

Updated this week

SMS error codes

This guide will help you to troubleshoot any SMS error statuses you may see. Each error code includes a description, possible causes and steps you can take to resolve the issue.

Status

Description

What to Do

Queued

Message is queued for delivery

No action needed. If delays persist, check network connection or contact support.

Scheduled

Message is scheduled for delivery

No action needed until scheduled time has passed.

Sent

Message sent to the network for delivery

No action required unless further updates don’t appear.

Sent

Message delivered to the handset

No action required.

Cancelled

Message is cancelled

Verify why message was cancelled. Attempt to resend or contact support if needed.

CancelledAfterReview

The message was canceled by ClickSend staff as its content did not comply with our guidelines.

If you believe your message was incorrectly flagged, or if you need clarification on the cancellation, contact ClickSend Support for further assistance.

WaitApproval

Message is waiting manual approval from ClickSend staff

Allow time for approval. Contact support if status does not update.

Failed

Unknown failure

Retry sending. If problem persists, contact support for investigation.

Failed

Unknown subscriber; number is inactive or invalid

Confirm phone number is correct and active.

Failed

Unidentified subscriber; invalid number or network routing issue

Ensure recipient number is valid. Reach out to support if errors continue.

Failed

Illegal subscriber; rejection due to failed authentication or filtering

Verify recipient network compatibility with SMS. Contact support if needed.

Failed

Rejection due to subscription or network not supporting SMS

Verify that recipient’s network supports SMS services. Contact recipient for confirmation.

Failed

Absent subscriber; phone out of range or off for 12+ hours

Retry sending later. Error typically clears once recipient’s device is back online.

Failed

Memory capacity exceeded; recipient’s device lacks space for SMS

Contact recipient to free up space on device, then retry.

Failed

Rejected due to network congestion or error

Retry the message in a few minutes. Contact support if issue persists.

Failed

Rejected by the recipient network

Reach out to support. There may be network restrictions affecting delivery.

Failed

Temporary network error; ClickSend will retry automatically

Wait for retry. No action necessary unless error repeats.

Failed

Network timeout when delivering message

Retry the message. Contact support if persistent timeouts occur.

Failed

Network routing error

Verify recipient number and retry. Contact support if issue continues.

Failed

Anti-spam rejection by recipient network

Ensure message complies with anti-spam guidelines. Modify and retry.

Failed

Message delivery receipt expired

Retry message. If problem repeats, contact support for assistance.


SMS sending speed and message throughput

ClickSend is built for speed. We start sending your messages to the network as soon as we receive them.

  • Most messages are delivered within 6 seconds.

  • We can accept messages at any rate—send them as fast as your system allows.

  • For high-volume sending (e.g. 100,000+ messages at once), we can configure a throughput of up to 30,000 messages per minute.

Need faster throughput?

If you're sending time-sensitive or mission-critical messages, let us know. We may be able to:

  • Increase the priority of your account

  • Configure higher throughput based on your use case

Several enterprise clients use ClickSend for urgent, large-scale communications. Reach out to support to see if you're eligible.

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