Ahh yes, in the UK there was one called X-stream (and another called ic24) for a while which did exactly the same thing with an ad banner in exchange for a toll-free number. I think it was only free at weekends, and you’d have to retry hundreds of times to get through once word got out, only to end up with a crappy connection so slow you could barely use it. Still, it was free!
Here it is: https://archive.org/details/bluelight_201711