- Symptom
- Outbound texts fail, show as undelivered, or contacts never receive them.
- Likely cause
- Most delivery failures trace back to an unapproved texting registration, carrier filtering of the message content, or a contact who has opted out.
Applies to: US phone numbers, Conversations, Workflow SMS actions
How to fix it
Confirm your texting registration is approved
Open your phone number settings and confirm the brand and campaign registration show as approved for the number you send from. Unregistered US traffic is heavily filtered by carriers.
Review the message wording
Remove public link shorteners and wording carriers commonly filter, such as aggressive offers or all-caps urgency. Send a short plain test message to your own phone.
Check the contact's opt-out status
Open the contact and confirm they have not replied STOP and are not marked do-not-disturb for SMS.
Confirm the sending number
Make sure the number used by the conversation or workflow is assigned to the right user and location.
FAQ
How long do carriers take to approve registration?
It varies. Many approvals land within a few days, but rejections and resubmissions can stretch that to a few weeks.
Can I send texts while registration is pending?
Some low-volume traffic may go through, but delivery is unreliable until the campaign is approved.