TECH TIPS News: Are you also tired of constant interruptions from spam calls and messages trying to sell you something you don't need? Despite efforts by the Telecom Regulatory Authority of India (Trai), pesky telemarketing calls persist. However, you can take matters into your own hands by activating the Do Not Disturb (DND) feature on your mobile network. Here's how to do it on networks like Jio, Airtel, and Vi.