Source note · Troubleshooting business SMS that is not delivered
AWS states that for US toll-free numbers the opt-out and opt-in keywords are set at the carrier level as STOP and UNSTOP, are the only usable keywords, and neither they nor their responses can be modified.
disputed · Checked 2026-10-02
For toll-free numbers, the keyword opt-out and opt-in responses are set at the carrier level, using STOP and UNSTOP.
- Vendor
- Amazon Web Services
- Product
- AWS End User Messaging SMS
- Subsystem
- opt-out handling
- Deployment
- multi-tenant
- Region
- us
- Release range
- current as of 2026-10-02
- Status
- disputed
- Checked
- 2026-10-02
Sources
- AWS End User Messaging SMS Best Practices — Amazon Web Services · tier 2 current vendor documentation · Prohibited message content section, third bullet
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting business SMS that is not delivered: source note business-sms-delivery-troubleshooting-aws-tf-optout-fixed. WarmTransfer. https://warmtransfer.net/knowledge/claims/business-sms-delivery-troubleshooting-aws-tf-optout-fixed
BibTeX
@misc{warmtransfer-claim-business-sms-delivery-troubleshooting-aws-tf-optout-fixed,
title = {Troubleshooting business SMS that is not delivered: source note business-sms-delivery-troubleshooting-aws-tf-optout-fixed},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/business-sms-delivery-troubleshooting-aws-tf-optout-fixed},
note = {Source note business-sms-delivery-troubleshooting-aws-tf-optout-fixed, checked 2026-10-02}
}