Is FaceTime free (including internationally)? From what I've read so far, it seems like VIDEO FaceTime will be free for both parties, other than:


If the party is using WiFi, whatever they have to pay their ISP for internet access. This is usually a flat rate, though some people have data caps.
If the party is using cellular service (e.g. 4G), whatever they have to pay their carrier for internet access. This may be "unlimited" or charged per GB.


If you change to audio-only then it may become a regular phone call for both parties, which will typically be free within the same country but extremely expensive between two different countries.

Is the above correct? I want to FaceTime my friend in China but I was worried about paying a huge rate. However if the above is correct then we should be OK as long as we are using video. See The Telegraph's Why did my FaceTime calls to Switzerland cost £144? suggests downgrading to audio can hurt, but I am not sure if the article is accurate.
Both FaceTime and FaceTime Audio are data and never go through the phone network as a regular phone call. You will be charged in the same way as using the internet for other purposes on your phone, over Wi-Fi or mobile data depending on your scenario.

FaceTime Audio calls don't ‘become’ regular calls. I'm almost certain the case from the linked article must be describing user error, calling someone not through FaceTime Audio but a normal phone call, and the user mistook the buttons they were pressing on their phone.

Besides any network fees, Apple does not charge a toll or fee to make or receive any calls. The license to the software and iCloud infrastructure is included with the cost of the Apple hardware.

There are certain countries that prohibit FaceTime services such as Saudi Arabia and UAE so you would not be able to make FaceTime or FaceTime Audio calls to these locations, but this would not cause a switch to normal calls. Net neutrality is evolving in several countries and there is no technical reason why FaceTime audio or video couldn’t be charged for above and beyond other forms of data.