Confused about the iphone data?

Just got an iPhone 4S. But all I wanted to know is if apps I download that use the Internet affect the data when I'm home and have Wi-Fi. I'm with sprint, but when I was signing up with my phone, I put in my Wi-Fi and it was connected. So does Internet used apps affect my data?

When you're connected to any Wi-Fi, it doesn't use your data. The only time your data is used is when you are on 3G. Hope this helped.

Whenever your phone is connected to your (or any other) Wi-Fi, it uses the internet connection of that Wi-Fi. Your data is not used in any way. Only when you're online via 3G / HSDPA is your data used.

Edit: 15 minutes after I post my answer, kelly posts the exact same answer I just gave.wtf.

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