I started w/the C= 64 like so many others, 300 baud modem. Got a 1200 at some point.
But my claim to fame (in my own head) would be running what I believe might've been the first multiline BBS on a personal computer, an Amiga 2000 with four Supra 2400zi modems (as soon as they were available) with BB/OS software which was designed for multiline.
At the time PCs and Macs didn't generally have multiple serial ports, and the systems that offered multitasking aside from the Amiga were the NeXT and OS/2, Macs didn't, PCs didn't, I'm unsure of the Atari STs could have multiple serial ports then, but didn't know any BBSes run on those regardless.
The fun part was getting the phone company to cope with a personal residence having four more phone lines, I had to go through the commercial division and they created rates for me, it was all new to them too, heh.