If you receive an error message and your text was not delivered, hover over the red error to view what might have happened. Here are a few errors that you might have received.

30003: Message Delivery - Unreachable destination handset: The destination carrier reports the “To” number is unreachable, the device is likely powered down, out of the service area, or may not accept your message.
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30004: Message Delivery - Message blocked: Your message has been blocked from reaching the destination by the carrier.
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30005: Message Delivery - Unknown destination handset: The destination carrier is reporting the To number is unknown, or no longer in service.
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30006: Message Delivery - Landline or unreachable carrier: The destination is a landline phone, or the destination carrier can’t be reached.
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30007: Message Delivery - Carrier Violation: The destination carrier is filtering out your messages.
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30008: Message Delivery - Unknown error: The destination carrier has returned an undefined error message. 

30034 : Message Delivery - US A2P 10DLC - Message from an Unregistered Number

​Related Article How to avoid carrier filtering

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