What is Toll-Free Sender Verification?

Sabaah_A — Wed, 08 Apr 2026 08:44:24 GMT

Toll-Free sender verification is a lightweight registration process where customers’ business information and use cases are submitted to the wireless carriers in order to verify the business is who they say they are, with the end goal of weeding out bad actors and spam generators for. Verification is required in order to originate traffic from a toll-free number for both U.S. and Canadian destinations.

Toll-free sender verification requires a completed Verified Sender Form (VSF). The client must complete the online Verified Sender Form (VSF) found here: Toll-Free Verified Sender Form.

On the VSF, the client will provide information on the business (message sender), messaging use case, opt-in process, and sample message content associated with their Toll-Free number. After completion, Sinch will submit the Verified Sender information to the wireless carriers for review and approval. The turn around time for Toll-Free Sender Verification is up to 5 business days.

What are the benefits of going through the Verified Sender process?

Verification is required in order to originate toll-free messaging traffic on the carriers' network
Carrier-sanctioned messaging channel
Increased protection for your customer’s brand
No volumetric restrictions

What does “Verified” mean?

A “Verified” number means that the traffic does not fall into Sinch's A2P Messaging in the United States & Canada - Disallowed Content and is able to confirm that the traffic is in line with Carrier Best Practices (see US Product compliance info) for sending content. It also means that the Toll-Free with the business submitted through the process.

What happens if my Toll-Free numbers are not verified?

Messages from unverified TFNs will be blocked. TFNs must be verified in order to originate traffic. Please refer to Do I need to complete a Verified Sender Form for my Toll-Free number?

Is there an automatic way to verify a number?

At this time, there is no automatic way to complete sender verification for TFNs. Every VSF is submitted and reviewed manually by Sinch.

Learn more about Toll-Free Numbers from Sinch.

article What is Toll-Free Sender Verification? in Toll-Free Numbers (TFN)

What is Toll-Free Sender Verification?

What are the benefits of going through the Verified Sender process?

What does “Verified” mean?

What happens if my Toll-Free numbers are not verified?

Is there an automatic way to verify a number?