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data usage on wifi

No. Your data plan is for Internet access through the cell networks. If you get wi-fi, your phone will not access the cell networks, and will instead access the wi-fi network.

Be careful where you use wi-fi, though. I picked up a wi-fi signal at work, and then quickly realized that I did not want to be on their network with my phone. If you're at a laundromat or a restaurant or a hotel or some place that offers it for everybody... I wouldn't worry. But I would use judgment with using wi-fi with somebody who can find out who you are... depending upon what you look up, obviously.
 
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