TSSRegistry: What is a Service Registrar? March 27, 2026 12:09 Updated A Service Registrar is an organization who is certified to text enable Toll-Free Numbers through the TSSRegistry™. Related articles TSSRegistry: How do I register to become a certified Service Registrar? TSSRegistry: What is it going to cost Resp Orgs when their Toll-Free Numbers are text enabled? TFNRegistry UI: What are the MNC Request Type Fields, their Descriptions and Valid Values for the BMC Page? TFNRegistry UI: How do I Use the Acting As Feature for the MNC Page? TFNRegistry: How do I Register for a Training Class or Obtain a Student Guide?