Whenever i'm connected to WiFi, is that what my net goes through?

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Never used wi-fi on a phone before. Once i'm connected to my local wi-fi, is that what the internet goes through and i won't be using my data usage or do i need to do something to make sure it's running through wi-fi and not using my usage?

yup once you are on wifi the data connection logo should disappear and all traffic should be via the wifi connection.

try downloading 3g watchdog from the market to keep track of data usage. its really useful.. for me anyway

cheers