What's the best iOS app for sending free messages and making calls to people in other countries?

WhatsApp Messenger is the leading choice for cost-free international communication on iOS. Its core functionality relies on an internet connection, allowing users to bypass traditional SMS and voice call charges. This is particularly valuable for staying in touch with family, friends, or colleagues abroad. The app supports one-on-one and group text chats, voice messages, and high-quality voice and video calls. A key feature is end-to-end encryption, which is applied by default to all personal communications, offering a significant privacy advantage over standard SMS. Media sharing is robust, enabling the sending of photos, videos, and documents directly within conversations. For broader updates, the Status feature functions similarly to stories on other platforms. However, reviews indicate some ongoing technical inconsistencies, such as occasional app freezes on newer iOS versions or sporadic connectivity issues that can interrupt calls. Furthermore, all participants must have the app installed, which can be a minor hurdle. Despite these imperfections, its widespread global adoption and zero-cost model make it an essential tool for international communication. Its utility is underscored by its simple interface and the ability to create chat groups for planning events or coordinating with international teams.