Telephone research involves the study of telecommunication technologies, systems, and services related to telephone communication. This research area focuses on understanding the history, development, and evolution of the telephone, as well as examining the impact of telecommunications on society, businesses, and individuals. Researchers in this field may explore topics such as telephone network infrastructure, communication protocols, voice over IP (VoIP) technologies, mobile phone networks, and the integration of telephone services with other digital communication platforms. Studies in telephone research may also include investigations into user behavior, preferences, and trends in telephone usage.