Smartphones (which I'll define as anything with a keyboard that doesn't require you to do T9 input) are now so cheap that there is close to a 1:1 overlap betwee

Smartphones (which I'll define as anything with a keyboard that doesn't require you to do T9 input) are now so cheap that there is close to a 1:1 overlap between "smartphone owners" and "people who do anything with their phone other than talk on it". I think this goes right to your addressable market: I'm concerned that you might be creating a cool, useful application for a non-web savvy, non-phone savvy market.