Clicking on Not delivered will show details on the delivery issue. Typically, delivery issues are related to invalid/disconnected mobile numbers or a landline number listed as a mobile number on a contact's record.
Note: To reduce and avoid the occurrence of delivery errors, you can enable the Phone Number Validation service (if not already enabled).
Here is a list of possible issues that could cause delivery problems:
|21211||The phone number is not a valid mobile number.|
|21217||The phone number is not a valid mobile number.|
|21408||This message could not be delivered, as the region this mobile belongs to has not been enabled. Please contact firstname.lastname@example.org.|
|21610||The recipient's number cannot receive messages because it is on an opt out list at our SMS gateway.|
|21614||The phone number is not a valid mobile number.|
|30001||Unable to deliver message due to an undetermined issue. Please contact email@example.com.|
|30002||Unable to deliver message due to an undetermined issue. Please contact firstname.lastname@example.org.|
|30003||The recipient could not be reached. The mobile handset may be in a poor coverage area or without access to the network.|
|30004||The recipient's number is blocked from receiving messages and may be blacklisted.|
|30005||The recipient's number does not exist.|
|30006||The recipient's number is a landline or is associated with an unknown carrier.|
|30007||The recipient's carrier has filtered your message due to a carrier violation. Please contact email@example.com for more information.|
|30008||The message could not be delivered due to an error. The receiving number may be a landline or associated with an unknown carrier. If sending an image, please ensure the file type is correct.|
|30009|| Please contact support.