This is awful, but mobile broadband have had filters on for ages. T-Mobile has something called content lock. O2 has another adults-only lock. You have to go into a shop with proof of age to get them turned off.

There's no granularity - it's either on or off and a bunch of stuff gets blocked that shouldn't and a bunch of stuff gets through that (if the filters were working) shouldn't.

I didn't try a proxy, but I guess that's a trivial way to defeat the filters. Looks like boom time for those bittorrent vpn providers.