Opera Mini 5 Browser - can you get it to work with Betfair?

Its the best mobile Browser I've came across and I can log into Betfair, read the forum but can't bet or reply to any messages.

I'm using a Sony Ericsson K800i. It seems to be more screen resolution than a problem with the browser. Download it

http://www.opera.com/mobile/

And tell me if you can get it working properly. I'm looking to change my PAYG phone and it would sway my decision if anyone could get it to work properly.