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Residential ISDN was very rare in the US. I rented a house in the 90s with a few fellow nerds and we got ISDN in our house, but it was definitely expensive (and required a network terminal device) and you always had to be routed to a specialist at the phone company if there were any issues, since most of the support people had never heard of it.

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.

Oh how the tides have turned.