modem

modeemi A device that encodes digital computer signals into analog/analogue telephone signals and vice versa and allows computers to communicate over a phone line.
To transmit by modem.
1992, Jim Kimble, How to get started with modems (page 73)

Personal modeming is most prevalent in the U.S., where a modem generally doesn't have huge taxes slapped on it, and after-tax income is comparatively high.

“Books” can even be faxed or modemed to you!