Free mobile, subsidized by ads is an attractive vision - but you need a network to do it. And, maybe advertising revenue is not sufficient... yet. However, bec

Free mobile, subsidized by ads is an attractive vision - but you need a network to do it. And, maybe advertising revenue is not sufficient... yet. However, because ad revenue increases over time, and network cost decreases, it seems inevitable. e.g. Google tried to do this with wifi in san fran (but IIRC had council problems). Google already has huge market share, so it's probably not crucial for them. But an up-and-coming search/advertiser with lots of money (like MS) is motivated and able.