If you FaceTime on an iPhone 4 does it add on to your bill?

Hi I'm 13 and my dad sent my an iPhone 4. If I FaceTime on it will he be able to see if I FaceTime or text?

He can always see when you are texting, but he can never see when you are using FaceTime.

No, you'll only be charged for the data if you use Facetime over 3G.

If you share his email and credit card info for the App Store, then there's a chance that he can see it.