How to check the DND status of my mobile number?

Click this link below to reach a weblink given by TRAI

1. http://nccptrai.gov.in/nccpregistry/search.misc
2. Type your mobile number
3. Click Search.

That's it.

How to unblock Telemarketing calls?

Mmmmm... very strange question...

1. Dial/Call 1909 and follow the instructions from your mobile.
   You can also dial from your landline.
   OR
2. SMS to 1909 with keywords 'STOP DND' for de-registration

How to block Telemarketing calls?

Very simple!

1. Dial 1909 and follow the instructions from your mobile.
   You can also dial from your landline.
   OR
2. SMS to 1909 with the words 'START DND' and follow the instructions to register.