If connected to Wi-Fi, does the iphone 4s affect your data bill?

I just recently gotten my iphone 4s, (yay! And i know it has a monthly data plan that i'm going to pay for. I was just wondering, if i'm at home and connect to my Wi-Fi network that i use for everything in my house (computers, e.c.t) using my phone, will it charge my data plan for over use? Or does being connected to your own network not take away data time/ charge you on your plan.

Don't think so but i also don't think unicorns eat lepercons

They don't charge you for wi-fi its free.

Nope it doesn't.
If you're connected to Wi-Fi then your 3G isn't being used. Therefore, it doesn't affect your data plan.
I always try and find Wi-Fi wherever I go, but my phone has a setting that automatically connects to the strongest signal if it doesn't require a password, which is awesome. =P

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