How does STOP work on a Toll-Free number?

[Meredith_W]

When a mobile subscriber texts in the keyword STOP to a toll-free number (TFN), the STOP response is enforced by the network. This means that the end user will receive a network message in reply that says ""NETWORK MSG: You replied with the word "stop" which blocks all texts sent from this number. Text back "unstop" or "start" to receive messages again." 

Any further messages to the subscriber from the TFN will be automatically blocked at the network level, until the end user texts in START or UNSTOP. Network-managed opt-in/out is also supported in the French language (i.e. ARRET/NONARRET).

We will pass on the inbound STOP message from the end user to you, so you can take action to update your subscriber lists and stop messaging the subscriber. If you send a message from a TFN to a subscriber that has opted out, you will receive error code 257 "User opted out (STOP)" from Sinch. 

All TFN error codes can be found here.

[#2]

Unverified toll-free numbers (TFNs) and Pending Verification toll-free numbers (TFNs) are subject to industry-wide message blocking. Unverified toll-free numbers are TFNs that have not completed the toll-free sender verification process. Pending Verification toll-free numbers are TFNs where a verification request has been submitted, but the request is pending review and approval. 

Note: In the past it was possible to send messages from an Unverified TFN or Pending Verification TFN. However, as a result of industry-wide changes, all toll-free numbers, regardless of the use case, must be Verified to originate traffic.

UNVERIFIED toll-free numbers (TFNs) are subject to industry-wide message blocking, effective November 8, 2023.

PENDING VERIFICATION toll-free numbers (TFNs) are subject to industry-wide message blocking, effective January 31, 2024.

All toll-free numbers (TFNs) must be in a VERIFIED state in order to originate traffic.

Unverified TFNs and TFNs pending verification will be blocked with Sinch error code 64 “Blocked due to exceeded quota”. Please see Toll-Free Delivery Report Errors for a full list of Sinch Toll-Free error codes.