I don't know how far this is true but today got this from fwd chain of mails
Now its become easier to get the blood. All u need to do is just type "BLOOD <Needed Blood Group> to *9600097000* EX: BLOOD B+ BLOOD DONOR WILL CALL U. So please pass this message to all. It may save Many lives. -- C Neela Megha Shyam Anantapur.