Bypassing T–Mobile Image Proxy
Writing about web page http://www.lewiz.org/archive/2007/01/03/hacking-t-mobile-web-proxy/
T-Mobile UK Web 'n' Walk is a nice and speedy service. Chris has said he's seen it sync at 6.3Mbps. Another reason it is so fast (besides HSDPA connection) is the fact T-Mobile have a transparent image proxy that compresses all images until they are really really small and subsequently really really awful in image quality. This is fine for adverts, banners and picture titles and phone browsing, but starts to get annoying when you're using it on a UMPC or laptop or PC.
The simple fix is pressing CTRL+F5 to force a non-cached refresh. Fortunately there is a way of modifying the headers permenantly using a simple add-on for Mozilla Firefox as discovered and documented in this awesome guide.
Unfortunately I haven't found a way of modifying headers in IE yet.