According to statistics 25% of us will need blood transfusion at least once in our lives. And only less that 5% of the people donate blood once in their lives.
Most of the blood donation happens through voluntary organizations, whenever someone needs fresh blood we run to the nearest college or some other place where you can find a lot of people together.
Then there are many websites with donor databases which are searchable, blood group wise, area wise etc.
There are SMS services, in which you request blood via sending an SMS in a particular format and a request is send to every matching donor in the database. Blood donation happens if the donor responds.
The demo that we have setup can handle 30 simultaneous calls. Please wait until the beep before you press any button.