Emerging Industry Overview: Telephone Services and Accessories
As the telephone became a necessity, and as telephone penetration peaked, telephone companies began expanding their services and telephone equipment manufacturers began developing new accessories to make telephone use more convenient and to give users greater options. The wide array of telephone accessories and services was developed mainly by research and development teams at some of the country's better-known telecommunications companies. For the most part, telephone users avail themselves of these services through local service providers, although another telecommunications company may have developed the product or technology. Among the more popular telephone services and accessories are call block, call forwarding, caller ID, call waiting, call waiting ID, repeat dial, return call, signal ring, 900-call block, the cordless digital spread spectrum telephone, and conference calling.