What's a good iOS app for staying connected with friends who don't have phone numbers?

Google Chat shines as an excellent choice for staying in touch with friends who may not have phone numbers but do have access to computers. It bridges the communication gap by offering robust texting capabilities, along with video and calling features. While some users have noted that the video and calling functionalities could use some improvements in clarity, the core texting experience is highly rated. The app allows for seamless communication across different platforms, which is particularly useful for Apple users wanting to connect with Android users. The ability to connect with others regardless of phone number availability makes Google Chat a standout communication tool.