Sony ericsson w995 wifi?

Icriosphinx

New member
HI, i just bought sony ericsson w995.
I have connected it to my WiFi router and it works. I just wanted to ask that how do I know whether my WiFi is being used rather than my o2 data (which will cost me). Will My WiFi work by when it is activated and connected or the O2 data through my sim?
 
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