Turning off automatic internet connection

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I would like to make my Touch Pro not connect to 3G/Edge internet automatically whenever I momentarily lose my WiFi connection. The reason is, when Opera goes fullscreen, the taskbar is not visible anymore, so I'm not aware that surfing costs me real money.

Is there a way to do it? Please help.

You could use modaco nodata, it turns off data connections alltogether. It shouldn't turn off wifi if I'm correct, but I never use wifi.

settings->connections->connections->advanced->select network
choose my homenetwork in the dropdown rather then my isp or
what ever it's called with your setup