Iphone FACETIME abroad

I live in the UK and am on Orange network, I'm currently on holiday in Florida and have Aeroplane mode on, cellular data off and am connected to free Wi-Fi.
I want to FaceTime with somebody back in the UK, and it will connect but I'm just making sure it won't cost me or my friend?

Do it

Facetime is made to use for free. It can only be used through Wi-Fi therefore you don't have to worry about being charged! Enjoy your trip!

I don, t think you have to pay any charges. Good trip!