Tierzero is a business telecommunications service provider based in the United States, specializing in VoIP phone services, high-speed internet, and other communication solutions for businesses. The company offers a range of services including hosted PBX, SIP trunking, and dedicated internet access, catering primarily to small and medium-sized enterprises. Tierzero is known for its focus on delivering reliable and scalable communication solutions designed to enhance productivity and connectivity for its clients.