Tired of too many spam calls? Here is how to block them all at once

1. Open your SMS app and type START.

2. Now send this message to 1909.

3. Your service provider will send you a list of categories eg Banking, hospitality and others with their code.

4. Reply with the code for the category which you want to block.

5. Your telecom service provider sends you a message confirming your request. The DND service will start within 24 hours.