FaceTime is technically a VoIP application like Skype, but does not offer the same features.
FaceTime only features video chatting with contacts who are using an Apple device running iOS 4 or higher or FaceTime on a Mac.
You cannot use FaceTime with someone who does not meet these compatibility requirements.
Is Skype as good as FaceTime?
Overall, while Facetime is very promising, Skype still remains the superior calling tool because of its flexibility. Facetime can only be used with other Mac and iOS devices and that will be a major drawback for many users. Skype allows you to call anyone, anywhere and that remains its over riding appeal.
Can you use FaceTime with Gmail?
Under settings→Facetime → add your email id that should be your gmail id. I think in the newest versions of iOS you will need to logon to your iCloud account to add this new gmail id, iPhone doesn’t have an option to do that anymore. Once verified you should be able to use your gmail id for Facetime.
Can you FaceTime with a non Apple product?
Well, you cannot use iMessage or FaceTime with non-Apple devices.
Can you use Skype on Apple?
Skype is available on phones, tablets, PCs, and Macs. Video calls – Don’t just hear the cheers, see them! Make voice calls to anyone in the world on Skype. You can also call mobile and landlines at low rates.