Question about the iPhone 3GS?

Damien

New member
I've just got myself a Iphone 3GS and i have Wi-Fi all set up for my home internet and was wondering when i have it turned on would it use my home internet downloads or even tho it is on will it just use to download i have on my phone cap for the phone? or does the usage i have on my phone cap only apply when I'm out of my router rang or Wi-Fi off?
 
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