Every text you send moves through a series of delivery states. Knowing what each one means — and what a failure is telling you — makes it much faster to fix a message that did not get through.
Where to see delivery status
Open any conversation in the SMS area. Each outbound message shows its state:
- A single check mark — sent to the carrier
- A double check mark — delivered (or read)
- Red Not delivered text — the message failed or was undelivered; hover it to see the carrier's error detail
What each status means
- queued or sending — accepted and on its way out
- sent — handed off to the carrier network
- delivered — confirmed delivered to the handset
- undelivered — the carrier accepted it but could not deliver it
- failed — the send was rejected before it reached the recipient
- read — the recipient's app reported the message as read
Why messages fail or go undelivered
Most delivery problems come down to a few causes:
- A2P registration is not approved. Texting US and Canada numbers requires a registered 10DLC campaign. If your campaign is not VERIFIED, major carriers such as T-Mobile, AT&T, and Verizon may block messages — this commonly appears as error 30034.
- Missing Privacy or Terms URLs on your campaign — often error 30908.
- Invalid or non-mobile number — landlines and bad numbers come back as undelivered.
- The recipient opted out — a message to an opted-out number will not send.
Fix a blocked or failed send
Work through this checklist:
- Open the Campaigns tab and confirm your A2P campaign status is VERIFIED, not in progress or failed.
- Confirm the sending number is active and attached to that campaign.
- Check that the recipient's number is a valid mobile number.
- Confirm the recipient has not opted out — see Mark a contact DNC and understand STOP opt-outs.
A2P registration and sending
For US and Canada numbers, Revamp365 requires a registered messaging service before it will send. If you try to send without one, the message is rejected up front rather than failing later. While a campaign is still pending review, carriers may quietly drop messages, so it is worth waiting for the VERIFIED status before launching a large send.