FaceTime is supported by iPhone 4 or later, iPad 2 or later, iPad mini, and iPod touch 4th generation or later. Users who have Macs with built-in FaceTime cameras can use FaceTime for Mac to communicate with anyone who has a supported device.
FaceTime for was first introduced by Apple in the second half of 2010 on the iPhone 4, but it has since been expanded to other Apple products. FaceTime mainly utilizes the front facing camera on supported devices during video calls. It mimics a face-to-face conversation by enabling the caller and the receiver to see each other as they talk.
FaceTime is currently exclusive to Apple devices and is not compatible with any other video calling or VoIP applications. This means that FaceTime calls can only be made between compatible devices. Aside from video, FaceTime can also be used to make audio calls. With the exception of iPhone 4 and iPad 2, FaceTime can either be used via Wi-Fi or over a cellular data plan. Other feature such 720p resolution is only limited to supported devices, such as the Mac. The Apple FaceTime service does not incur any charges; all that is required to use it is a supported device and a valid Apple ID.