Opera Mini and the mobile 3G networks

So Opera Mini seems super fast, compared to the other smartphone browsers. And that's because all the pictures are compressed on the Opera servers before they are sent to you phone (I can still hardly believe this, but wikipedia confirms it). I used to think the 3G mobile network of T-mobile was super buggy, because internet seemed to just not work on it, or hardly, but now I understand these mobile networks are just not designed for the internet usuage your used to. And so KPN mobile internet, or another provider won't be much better? (T-mobile can also still be relatively crappy.)