The device that allows a computer to communicate with other computers via phone lines is called a modem. A modem, short for modulator-demodulator, is a hardware device that converts digital signals from a computer into analog signals that can be transmitted over telephone lines. To find this answer, you can conduct a quick search using a search engine by entering "devices that allow computers to communicate via phone lines." This will provide you with a list of devices, and you can identify the modem as the correct option.
