Works fine for Firefox on a Pixel 6. Took a couple of seconds to load then smooth (ginormous) scrolling was available.
Same for an old Android phone with outdated Snapdragon 660 I use to test app performance bottlenecks. Except this one took 4 secs to load.
Loaded just fine on my iPhone SE. I hope you’re not using anything older than that…
Limiting a phone's usable life to about five years feels somewhat arbitrary, and there are iPhones older than the (original) SE that are still getting security updates (5S/6).