Trouble with Wi-Fi hotspots?

I'm on my wi-fi at home, and apparently my DSi can't use it or something, so since my iphone's on the Wi-Fi, I'm wondering if making a personal hotspot would be kind of like a go-between. So what I'm asking is, if I make a hotspot with my phone (That's on AT&T wi-fi), will it use up my personal data? I have very limited data so I'd like to know before I try it.

Yes using your iphone as a Wi-Fi hot spot will use up the personal data from your phone

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