If I use my iphone on Wi-Fi will it use up my credit on 3G?

I have Wi-Fi with adsl2+ but if I use the interent will it use up the 3G credit or will it austomatically use my Wi-Fi? Or do I have to manually switch it over?

I'm pretty sure if you use the Wi-Fi without 3G its free and doesn't use your credit. I have an iphone with at&t and it only uses the data or credit when 3G is on.

If it's some one elses free Wi-Fi then its free. If it's your Wi-Fi then you pay for the Wi-Fi but thts got nothing to do with your phone

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