System tries to use unconnected WiFi network

[Oddible]

If I leave my WiFi on, every time the phone encounters a WiFi network I lose data connectivity because it tries to use the WiFi network even though it is passworded and I'm not logged on, instead of me 3G.

How do I prevent this behavior and just have it use my 3G until I'm logged into a WiFi network or the WiFi network has an internet connection?

 

[John Woo1]

Fo to wifi settings and you find what you needed there.
Wifi - menu - advanced.

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