@sabi for the most part: #HSCSD @ 115,2 kBit/s (mostly due to throttling on #3G networks which peaked at 7,2MBit/s...
But the absolute first was 64kBit/s #ISDN...
https://en.wikipedia.org/wiki/Circuit_Switched_Data
https://en.wikipedia.org/wiki/UMTS
@kkarhan more people than I thought had ISDN! I’ve only personally known one person who had an ISDN connection and it wasn’t his first. I did know the admin for my local ISP who at one point had four 33.6 modems in some sort of bonded configuration which was pretty rad but obviously not his first modem either.