Skype using iphone 4S 4G with At&t s UNLIMITED DATA PLAN?

I was wondering if it really is okay to video skype using my phone with the unlimited data plan. I already tried it though, twice, for about 15 mins each and it didn't cost me. I want to chat for as long as I want to (at least an hour).So do you think it's okay and won't charge me extra?

AT&T definitely won't charge you anything, I'm not sure about Skype though because I really don't use it.

It will not charge you, don't worry.

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