To make free international calls on an iPhone, you can use various methods: 1. Use internet-based calling apps: There are several apps available, such as WhatsApp, Skype, Viber, or Facebook Messenger, that allow you to make free voice and video calls over the internet to other users of the same app. 2. FaceTime: If the person you want to call also has an iPhone, iPad, or Mac with FaceTime, you can make free audio and video calls using FaceTime over Wi-Fi or cellular data. 3. Google Voice: Google Voice offers free calling within the United States and low-cost international calling rates. You can use the Google Voice app or website to make calls over Wi-Fi or cellular data. 4. Wi-Fi calling: Check with your mobile carrier if they offer Wi-Fi calling. If enabled, you can use your iPhone to make calls over a Wi-Fi network without using cellular minutes, potentially reducing international calling costs. Remember that for these methods to be free, both you and the person you are calling need to have the same app or service installed, and you need a stable internet connection. Additionally, data charges may apply if you are not connected to Wi-Fi while making the call.