During lockdown i've been building wifi modems inside old 56k modems. I have so far saved 7 modems from the ewaste and shipped them to my friends. You can't even tell from
Old Analog Modem Internet Connection Stock Photo 384569407 | Shutterstock
How 90s dial-up Internet worked, and let's make our own ISP. - YouTube
Is it possible to use an ADSL modem+router as a router? - Quora
Acoustic coupler modem, 300bps. Just like the one I used in junior high | Phone, Tech history, Computer history