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does wifi still use data?

when wifi is connected it shouldn't be using up any of your data. but if you are concerned about data being used you can turn off the mobile when your on wifi. just go to settings>wireless & networks; then check the box that says mobile networks
you'll still be able to use data since your on wifi and doesn't affect phone calls or text messages.

as for charging the phone overnight, it's totally okay to leave it on the charger overnight.
 
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