Do you use Internet data when you use FaceTime

My boyfriend just got the iPhone 4 and I have an iPod touch 4g. I was wondering would it use his data if he was to face time me. I was thinking that since its free because we both have apple accounts.

When you use Wi-Fi it doesn't use your data.

If you have Wi-Fi it doesn't use up your data. I don't think it works without Wi-Fi either

Yes it does your data but very little. The face time call uses a little more than a call but when he is Wi-Fi spot uses no data. But most of the time your boyfriend will not use data