Pretty hopeless but...
sorted their act out when I threatened to leave and take them to court for being so completely useless.
I was on their "old" billing system with unlimited texts and picture messages, but their old system couldn't cope with the "unlimited" mobile internet bundle (unlimited in this case meaning 500MB). So every month for 10 months I was being charged the off-plan rate for internet use, and then having to get my bill adjusted (and getting them to waive the non-DD payment fee since I had no faith in their billing). When they realised this was the case they said I still had to pay for the usage - even though I'd used it in good faith.
After the threatening letter, I was moved to the "new" billing system (and therefore a different tariff) - but the new system can't cope with bundled MMS messages.
In some ways they're a total bunch of clowns, in others they're much better than other networks (unless hell freezes over I'm never touching Orange again!).
Anyway, the WAP gateway is hopeless - didn't work for A-GPS on my N95 so swapped to the Internet gateway, and have got my Xperia X1 on the Internet gateway from day 2 of having it since the WAP gateway was still so very, very slow and rubbish!