Phone service refers to a communication system that allows people to make and receive phone calls using a telecommunications network. This can include traditional landline services provided by a local phone company, as well as mobile or cellular phone services offered by wireless carriers. Phone service typically involves the use of an active signal transmission between two devices connected through a public switched telephone network (PSTN) or a Voice over Internet Protocol (VoIP). The service allows users to make voice calls, send text messages, and access other communication features such as caller ID, call waiting, and voicemail.