Does the browser you use on that phone support websockets?
Internet Slow Down Day
This is targeted for those who are stateside mostly, but this could end up affecting everyone.
I saw the campaign mentioned on Reddit, and it seems like it would be pretty simple to add the script into a widget to display on your NodeBB install if you were interested in doing something along those lines.
Here's the campaign sign up if anyone is interested and has a lot of US traffic.