by default it is turned off. If the green light is not constantly on then you're not online. If it is however turned on then there is also a symbol next to clock. I'm not sure how you turn this off on the 902 as on the 903 you just tap on it and disconnect.
However, I wrote a simple app to disconnect from wifi. Unzip attached file and put it somewhere on the device. There are two files: wifi-on and wifi-off.
Enjoy!
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