I Phone 1
Through the WWDC event last June, Apple announced that FaceTime can now be used not only limited to iOS 15 and Apple devices, but also for other platforms such as Android and Windows.
FaceTime itself is an Apple service that allows users to make video calls. Same with other video call (or group call) applications, only limited to the Apple ecosystem. But now Apple seems to want to compete by expanding its reach to Android and Windows users.