When you are traveling outside of your home country and make a call back home, it is not considered International Calling; instead, it is known as International Roaming. International Calling is when you dial an international number within your home country. On the other hand, International Roaming is when you use your phone abroad and connect to foreign networks for calls, texts, or data. It is essential to understand the difference between these terms while using your mobile service to ensure that you purchase the correct service that you intend to use.