How to activate DND Service / Block Unwanted Calls and SMS in Airtel?
Airtel has around 357 million customers as of March 2016. In order to benefit its consumer, airtel DND (Do not disturb) service helps you to block telemarketing / unwanted calls and SMS. This tutorial will help you to learn how to activate DND service in airtel.
You can register for the preference via two methods :
→Send an SMS to 1909