You could get ISDN2 installed on domestic premises in the UK. It wasn't cheap though, because as soon as you wanted a bonded 128k channel the cost could become

You could get ISDN2 installed on domestic premises in the UK. It wasn't cheap though, because as soon as you wanted a bonded 128k channel the cost could become somewhat eye watering for a domestic user (or even a small business). The good thing though was that you got a guaranteed 64k rather than the vagueries of a 56k modem that in practice never actually worked at 56k, more like 30-45k depending on phone line quality. On top of that you could (if your wallet was fat enough) get ISDN30 (E1) which was akin to a T1 but ~500k faster. I did a fair amount of commissioning of these things back in the 90's.