Fax by Ciro Santilli 34 Updated Created
Uses telephone lines, and therefore were still usable much much after the Internet made them obsolete, which is quite funny.
Video 1.
Teletype ASR 33 Part 10: ASR 33 demo by CuriousMarc (2020)
Source.
Video 2.
Fax Machine by Museum of Obsolte Objects (2011)
Source.