What I learned from handcopying the Bone Fone ad by Joseph Sugarman

When talking to a problem aware audience, start with a story (or imaginary) that emphasizes on the problem OR creates interest for a solution of the problem.
Use the origin story of the product to increase trust. It got to be a true story. Even if it feels vague, it CAN be worked around to make it more intriguing without lying about it.
Use specific details to better illustrate the experience of the product.
Guess what the next thing in the reader's mind would be and handle it accordingly. For that, you need enough practice and pattern recognition. (I learnt it from the adweek copywriting handbook. But I can see this concept run underneath the ad.)
Don't cut off any details of the product. No matter how vague. There's always a way to make it more intriguing.
Challenging competitors products is a great way to showcase your confidence about the product. So the prospect feels confident buying it too.
Promise a risk free guarantee to lower skepticism.