No, and even better, Apple says these calls won't be eating up your voice minutes either. FaceTime calls are made over WiFi only, so you'll be free to make them anywhere you can find a WiFi signal (like Starbucks, perhaps?), without using carrier minutes, or any MB from your smartphone data plans. However, you'll need to start taking into account your data budget when (and if) AT&T starts allowing FaceTime calls over 3G. I'd stick to WiFi either way if I were you.