Possible Causes
The recipient's device is switched off or unavailable.
The device has a weak or no signal.
The number is unable to receive SMS (e.g., it belongs to a landline).
There is a carrier-related issue.
Possible Solutions
If the problem persists, follow this checklist:
Is the recipient’s device powered on?
Does the device have sufficient signal? Try restarting it.
Is the device connected to its home carrier’s network? Messages may not be delivered if roaming.
Can the device receive non-Textla SMS messages?
Can it receive messages from another Textla number or a shorter message body?
Can other devices using the same carrier receive your messages?
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.