Question About Video Cell Phones

Will someone have mercy on a technologically challenged person and explain something to me about the way video cell phones work? With video on demand, when a caller requests a download, how is his or her call routed, where is the video content hosted and how is it directed to the phone? Do cell phone service providers simply furnish the channel for the video transfer or do they host content themselves -- and where is the download charge assessed and by whom? Is the hosting of content and central exchange hub a website or part of the phone service provider's network? I know so little about this that even these questions might not make sense but I would be grateful for any help, or for direction to a source for this kind of basic information.

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Lloyd Fonvielle
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