During the early 2000s, the dot-com bubble coincided with a telco bubble, with everybody working themselves into a lather over the promise of WAP, basically dial-up modems for mobile phones: slow, underpowered, charged per minute and thus hugely expensive. Working at a telco operator, I had access to the logs of the WAP gateways serving up the stuff, and far and away the top use was porn, with waperotica.com being particularly dominant.
The catch: this was way before smartphones. The Nokia 3310, a typical device at the time, had a 84x84 black and white (really more black and olive) display, considerably worse than the CP/M 256×192 panned in the article -- and still people watched porn on it.