Telephone line modems were important in home and business computing for decades. Like a lot of people, I started with a Hayes Smartmodem 300. The modem came out in 1981 but I got mine about 1990. By then it was considered so slow that a lot of bulletin boards wouldn't let me call in.

From when did installed 1200bps modems outnumber 300bps units?

Related: [What technological factors drove the rise of “high-speed” modems in the early 1990s?](https://retrocomputing.stackexchange.com/questions/5064/what-technological-factors-drove-the-rise-of-high-speed-modems-in-the-early-19)