This logo was used from iOS 4.0 to 4.2. There wasn't any FaceTime logo on the iPhone or iPad, with, FaceTime being integrated into Contacts and the Phone apps. The app was first released only for the iPod Touch (4th generation iPod Touch onwards).
This logo was used from iOS 4.3 to iOS 6. The app was released for the first time on the iPad (iPad 2 onwards).
This logo is used since the launch of iOS 7 in September 2013. The app was released for the first time on the iPhone (iPhone 4 onwards).
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