Thanks!
So is this correct? (was a little different bto the path you suggested but I think this is what you meant):
In Advanced Options I clicked into "browser" and did the following:
Default Browser configuration: Hotspot Browser
Default MDS browser configuration: Internet Browser
Default WAP browser configuration: Optus Zoo
So will this ensure that if I can get into a WiFi connection (ie when I am at home, etc) it will automatically connect wifi (which does appear to be quicker, by the way!) and if no wireless network to connect to, it'll just use Blackberry internet service (so I wont be charged as its using my unlimited data plan)??
Thanks so much in advace, yet again!!!