Hi aircel users! do you get a number of unwanted calls daily from advertisement company,insurance agents and others?if you want to block these unwanted callers from calling you then follow certain simple steps to register your name in the national do not call registry and then you will have apeace mobile life.so sms"START DND" To 1909(Toll Free)Then You may get a sms like this"Dear Subscriber, Your request forDo Not Disturb service has been registered and also an referencenumber.