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.
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 | Status Code | Description | What to Do |
1 | Sent | 200 | Message sent to the network for delivery | No action required unless further updates don’t appear. |
2 | Sent | 201 | Message delivered to the handset | No action required. |
3 | Queued | 200 | Message is queued for delivery | No action needed. If delays persist, check network connection or contact support. |
4 | Scheduled | 200 | Message is scheduled for delivery | No action needed until scheduled time has passed. |
5 | WaitApproval | 200 | Message is waiting manual approval from ClickSend staff | Allow time for approval. Contact support if status does not update after some time. |
6 | CancelledAfterReview | – | The message was canceled by ClickSend staff as its content did not comply with guidelines | If you believe your message was incorrectly flagged, contact ClickSend Support for clarification. |
7 | Cancelled | 301 | Message is cancelled | Verify why the message was cancelled. Attempt to resend or contact support if needed. |
8 | Failed | 301 | Unknown failure | Retry sending. If problem persists, contact support for investigation. |
9 | Failed | 301 | Unknown subscriber; number is inactive or invalid | Confirm phone number is correct and active. |
10 | Failed | 301 | Unidentified subscriber; invalid number or network routing issue | Ensure recipient number is valid. Contact support if errors continue. |
11 | Failed | 301 | Illegal subscriber; rejection due to failed authentication or filtering | Verify recipient network compatibility with SMS. Contact support if needed. |
12 | Failed | 301 | Rejection due to subscription, handset, or network not supporting SMS | Verify recipient’s network supports SMS services. Contact recipient for confirmation. |
13 | Failed | 301 | Absent subscriber; phone out of range or off for 12+ hours | Retry sending later. Error typically clears once recipient’s device is back online. |
14 | Failed | 301 | Memory capacity exceeded; recipient’s device lacks space for SMS | Contact recipient to free up space on device, then retry. |
15 | Failed | 301 | Rejected due to network congestion or error | Retry the message in a few minutes. Contact support if issue persists. |
16 | Failed | 301 | Rejected by the recipient network | Reach out to support. There may be network restrictions affecting delivery. |
17 | Failed | 300 | Temporary network error; ClickSend will retry automatically | Wait for retry. No action necessary unless error repeats. |
18 | Failed | 301 | Network timeout when delivering message | Retry the message. Contact support if persistent timeouts occur. |
19 | Failed | 301 | Network routing error | Verify recipient number and retry. Contact support if issue continues. |
20 | Failed | 301 | Anti-spam rejection by recipient network | Ensure message complies with anti-spam guidelines. Modify and retry. |
21 | Failed | 301 | Message delivery receipt expired | Retry message. If problem repeats, contact support for assistance. |