Back in the 70s, I dialed a number on my parent’s rotary phone. When the remote computer answered, I would shove the handset into the earmuffs on the acoustic coupler[1].

It usually worked. I don’t remember if the baud rate was 300 or 110.

1. https://en.m.wikipedia.org/wiki/Acoustic_coupler

I also ran through most of the modem speeds. All the lower speeds were calls made to BBSs, pre internet. 1200, 2400, 9600, 14400, 28800, 33600…

I recall accessing Prestel at 1200/75 - 1200 baud coming down, but a measly 75 baud going back up!

Modems used to cost a dollar a baud, about $100 for a 110 baud modem, $300 for a 300 baud modem, and $1200 for a 1200 baud modem.