Undelivered Messages

If there is a problem with text message delivery, Cadence will display an alert indicating that a delivery issue has occurred:

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).

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Here is a list of possible issues that could cause delivery problems:

Code	Error Message
11751	Media exceeds carrier size limit.
12300	Media type is invalid.
21211	The message could not be delivered. It is likely that the receiving number is not a valid mobile number.
21217	The message could not be delivered. It is likely that the receiving 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 support@hellomongoose.com.
21610	The recipient's number cannot receive messages because it is on an opt out list at our SMS gateway.
21612	This number is not currently reachable via
21614	The message could not be delivered. It is likely that the receiving number is not a valid mobile number.
21623	Too many media uploads
30001	Unable to deliver message due to an undetermined issue. Please contact support@hellomongoose.com.
30002	Unable to deliver message due to an undetermined issue. Please contact support@hellomongoose.com.
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 message could not be delivered due to the carrier's content-based spam filtering.
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.
30034	Unable to deliver message due to unregistered campaign carrier message filtering