Understand SMS delivery statuses
Read the check and alert icons on outbound texts to know if a message sent, delivered, or failed.
Every text you send from SAMI OS shows a small status icon beneath the message bubble. That icon tells you, at a glance, whether the carrier accepted the message, delivered it to the contact, or rejected it.
Read the delivery icons
Open any conversation in Messages and look at the bottom-right corner of your outbound bubbles, next to the timestamp. The icon updates on its own as the carrier reports back.
- Single check — Sent. The message left SAMI OS and the carrier accepted it for delivery to the contact's phone.
- Double check — Delivered. The carrier confirmed the message reached the contact's device. This is the result you want.
- Red alert icon — Failed. The carrier could not deliver the message. It will not retry on its own.
A new message starts in a queued state and shows no icon yet. Within a few seconds it moves to a single check, and usually to a double check shortly after. Incoming messages from your contacts never show a status icon — these indicators are only for texts you send.
Diagnose a failed message
A red alert icon almost always points to one of a few causes. Work through them in order.
Confirm your number is registered for A2P 10DLC
US carriers block business texting from numbers that aren't registered. If your campaign isn't approved, every outbound text fails. Check your status under A2P registration and complete the brand and campaign steps if they're still pending.
Make sure a sending number is assigned
SAMI OS sends from your manual outbound line. If no number is available for texting, the send is rejected before it ever reaches the carrier. Buy or free up a number in Phone numbers, and confirm one isn't fully reserved for a SAMI Bot.
Check the contact's number
A failure can simply mean the destination is invalid — a landline, a disconnected line, or a mistyped number. Open the contact and verify the mobile number is correct and complete.
Rule out an opt-out
If the contact replied STOP, the carrier blocks all further texts to them and your message fails. Review your opt-out and Do Not Contact handling before trying again from another channel.
Carriers don't retry a failed message, and resending the same text to a blocked or invalid number will fail again. Fix the underlying cause first — registration, the sending number, or the contact's number — then send a fresh message.
When everything looks right but texts still fail
If your A2P campaign is approved and a valid number is assigned but messages keep failing, the issue is usually message content that carriers filter (links, all-caps, or spam-like phrasing) or a temporary carrier outage. Reword the message, send a plain test to your own phone, and check your registration status again in A2P registration. You can also confirm your line's health in Phone numbers.
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Last updated 2026-06-21