I've just brought a Sony Ericsson X10 Mini Pro and have added my o2 sim. I previously had an iphone and with my o2 package I was able to access the internet and app's without being connected to a wifi network for free - using 3G. I'm still using the same sim but at the moment I can only connect to the internet and apps if I'm connected to a wifi network. How do I set up 3G so I can access these things anywhere at anytime? Thanks