This document discusses using smartphone technology to increase the national blood supply. It notes that the blood supply has dropped to its lowest level in 15 years, with only a one day reserve. Smartphones now represent over 50% of mobile subscribers in the US and China. An app could leverage location services and user biographical data to schedule blood donations more efficiently based on emergencies. By sending targeted alerts, smartphone technology could maximize the reach of blood donation organizations to thousands immediately, saving millions of dollars and lives.