Apps like Truecaller must have put a serious dent in the telemarketing business. Now that I can screen all my calls, I don't have to listen to a telecaller just because I feel sorry for them. If I don't pick up, neither they nor I feel bad. But TRAI needs to crack the whip on these telemarketers. Despite being registered on DND, I receive at least 10-12 spam calls everyday. Sure, I don't answer those calls, but the calls are an intrusion. I hope TRAI does something about this soon.