Possible Causes
Incoming MMS is not supported in the recipient’s region.
The recipient’s device does not support MMS or has MMS disabled.
Possible Solutions
Notify the recipient that you cannot send MMS to them
Send an SMS message to these contacts (no image / file attached)
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.