How to block spam calls and register DND on Jio, Airtel and Vodafone

Aug 2, 2022 · 5 min read · How to block spam calls and register DND on Jio, Airtel and Vodafone Telemarketing calls and other spam calls can turn irritating after a certain point. This becomes a major issue, especially when you have a busy day or when you are expecting an impo...