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Wi-Fi Noob Question

Just to confirm what Japester said, and also add that if you want to be extra sure, you can add a widget that lets you disable mobile data when you're not using it (under widgets -> settings), although that shouldn't be necessary it does give peace of mind (I do this just in case I wander out of a WiFi area while my phone's doing something data intensive).

You can also check it's working using something like 3G Watchdog, which monitors your mobile data usage.
 
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