Prime has been discussed many times to date on the forums. Short answer: Amazon does not allow Prime to be accessed from TV provider set top boxes. Until Amazon changes their mind, it won't be possible. Knowing Amazon they are likely doing it that way so they have greater control over both the money, user experience, as well as all of the data including analytics. Plus Amazon licensed their Fire TV platform to TV manufacturers to so that's more of a financial incentive for them to keep that up rather than spending a lot of money to try bring Amazon Prime to the various different set top box platforms that exist.
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