what's the one thing phones have tons of that desktops don't? sensors. lots and lots of them, and many of them don't require an explicit permission to access.

what's the one thing phones have tons of that desktops don't? sensors. lots and lots of them, and many of them don't require an explicit permission to access. if you pay the developers of a few nigh-ubiquitous mobile app dev libraries to let you phone home sensor data while their apps are on, you can probably get some really interesting novel information, and you might be able to find somebody willing to buy a dataset constructed from sensors on 50% of all smartphones.