It is well-known among bargain hunters that the new condition Amazon Fire Phone includes one year of Prime Membership with it. With a current price of $160 for the phone (no contract by the way), you are essentially getting the phone for $60, because a Prime membership is well worth the $100/year (2-day shipping, Video streaming, Music streaming, e-book library, and so forth). If you are a current Prime member, each Fire Phone extends your membership by another year (as in an extra 365 days).

What is not as well known but explained in its own paragraph in the Terms and Conditions page is that if you are already an AmazonFresh Prime member (the $300/year plan), buying and activating a Fire Phone on your account gets you an additional FOUR months added to your Prime Fresh membership.

Not only that, but the Prime memberships that come with each new Fire Phone are stackable. Meaning if you buy four new condition Fire Phones and activate them all on the same Amazon.com Prime account, your Prime membership gets extended by four more years. If your expiration was May 10, 2016 it will get bumped to May 10 in 2020.

Likewise with AmazonFresh, but instead of 12-month increments, your subscriptions are extended in four month increments.