Hi, I have trouble using apps and browsers when I am connected to public open wifi networks when I am out and about. I find the wifi network, connect and then go to try and use an app or browse the web and can't. It says no connection. I turn off wifi and connect to 3g and it works... I use my mobile on home network and mates wifi networks and it works fine, but when out and about it doesn't seem to work, am I doing something wrong?