How do you get a video conferencing cellphone?

Is video conferencing an application you can store on any phone? or do I have to buy a phone with video conferencing?
If so, what are some good looking phones with video conferencing?
Is there such thing as a one-way video conferencing conversation?
Can I only have a video conferencing conversation with someone who has it too?

That's a whole lotta questions..I know..

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