[nookiemonster]

"Android phones are available for free from carriers."

I can't find a way to interpret this statement and have it be true.

There is no fee to use the o.s. The devices cost the carriers a great deal. They purchase them in bulk from the oems and then sell them to customers. The cost is then recovered over the life of the contract.

This is why it's hard to know exactly how many windows phones are active in the ecosystem. The only public data is the bulk sales to carriers by oems.

Wrt your other points, I don't have any nits to pick. :)