iPad with or without cellular?
doni need anything specific in order to do FaceTime from an iPad?
iPad, iOS 8
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No, FaceTime can happen over Wi-Fi or over cellular, but cellular is not required at all.
The only restriction is you won't be able to FaceTime when away from a Wi-fi network, which is resolved by having cellular data service, much like a phone.
If this is not a concern, and you plan on FaceTiming form a place with Wi-Fi always, then you don't need cellular.