Possible Causes

  • The destination handset you are trying to reach is switched off or otherwise unavailable.
  • The device you are trying to reach does not have sufficient signal
  • The device cannot receive SMS (for example, the phone number belongs to a landline)
  • There is an issue with the mobile carrier

Possible Solutions

Troubleshoot with the following checklist: Is the destination device powered on? Does the device have sufficient signal? If not power the device off, wait 30 seconds, and then power it back up. Is the device connected to the home carrier's network? We cannot guarantee message delivery on devices roaming off-network. Can other devices using the same mobile carrier receive your messages?

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

Repeated Error 30003 results on undelivered messages sent could be due to carrier filtering.

The rules for carrier filtering vary throughout the industry, making it difficult at times to pin down exactly why a message is being filtered out. For more details including potential workarounds, please see this Help Center article "How Does Carrier Filtering Work?"

Continued Error 30003 issues

Zingle's Support team can help investigate what went wrong with delivering your message. Please collect 3 or more instances of the error occuring and chat in to our Support Team.

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