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Messages identified as SPAM will be rejected and error code 255 returned. Sinch continuously monitors for senders with a high number of SPAM rejections. If the SPAM message content is not resolved, the TFN is subject to blocking and deprovisioning. P...

Verified Toll-Free numbers don’t have throughput or volumetric restrictions. You should still be aware of existing TPS configured on your account and allocate accordingly.

If you are migrating a verified TFN Sinch, make sure to provide an updated Verified Sender Form to Sinch to prevent any interruptions.

Yes, Toll-Free sender verification improves deliverability for all traffic, including both US and Canadian destinations.

There is no cost to verify a Toll-Free number.