Possible Causes
The message delivery failed for an unknown reason provided by the carriers
Possible Solutions
Ensure the recipient’s phone is on and can receive SMS.
Confirm that the phone is not roaming.
Test sending messages to other phones using the same carrier.
Send a simple, shorter message to test for encoding issues.
Contact Textla Support with three or more recent Message SIDs showing error 30008.
Is this billed?
Yes, this error is billed by the carriers
Are contacts that return this error marked as “invalid”?
No, contacts that return this error are not marked as “invalid” in your Textla contact list.