Compatible Devices for Video Conferencing

I want to make use of our iPads or cellphones. I believe, it is important so that we could collaborate at once especially if unavoidable situation happens in an event that we need to settle immediately. I heard about video conferencing lately. Is the app suitable for any device? Would you know the compatible hardware?
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I guess most video conferencing apps are compatible on mobile phones and tablets. Skype, google hangouts and the likes are compatible to mobile phones and tablets