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SMS troubleshooting

Updated over 2 weeks ago

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.


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