Business Telephone Service Explained For the most part, business phone service comes in two variations: VoIP Traditional telephone service Business VoIP Phone Service VoIP, or voice over Internet protocol, is an alternative phone service technology to traditional phone service., Spectrum Business Phone service offers unlimited local and long-distance calling along with 35+ free advanced business calling features – more than any other provider. These features include transferring calls instantly, adding on hold music for a pleasant waiting experience and much more. Have an existing number?, While the best phone service depends on your individual team’s needs and preferences, there are plenty of great reasons to choose AT&T Phone for Business. AT&T Phone for Business includes unlimited calling in the U.S., plus calls to Mexico, Canada, and U.S. territories, more than 30 advanced and traditional calling features like Voice-to-Text , , , .