When were 800, 888, 877, 866, 855, 844, and 833 TFNs made available for use? December 19, 2025 13:18 Updated Related articles TFNRegistry UI: What are the Fields, their Descriptions and Valid Values for the URC Page? TFNRegistry UI: What are the Number Administration Parameters Fields, their Descriptions and Valid Values for the SPH Page? What is a Vanity Number? Is there any difference between 800, 888, 877, 866, 855, 844, and 833 TFNs? Somos: How can I get a specific Toll-Free Number (or vanity number) for my business?