If I turn cellular data off can I make calls?

I have and iPhone 4S. I'm going out of the country. If I turn off my cellular data can I still make calls with Wi-Fi?

Yes. Cellular data is for going on Internet anywhere (3G) and it usually costs an arm and a leg. Call are not maid over 3G so I recommend to turn it off so you don't get a surprise when you get you're monthly bill.

You don't use data nor Wi-Fi to make calls, you use your service providers network.