I can't help with your wifi problem, but just want to explain something. You seem to be getting confused between wifi and GPRS.
The settings you had sent were for the latter, so it won't have any effect on your wifi connection.
When you use wifi you're tapping into a broadband connection, from whatever provider (your home router or hotspots, such as The Cloud).
When you connect via GPRS / HSDPA you are using o2's data network.
So it's the wifi connection you should be looking at (see your phone manual and that of your router).
SV