How to stop this alert on Telegram app: * Open Telegram, and tap on the hamburger button, which is located on the top left corner of the screen. * Go to the Settings section and then jump to Notifications and Sounds. * Scroll down and tap on ‘Contact joined Telegram.’ * Open Signal on your Android smartphone and then tap on the three-dotted icon, located on the top right side of the screen. * Got to Settings, go to Notifications. * Now, scroll down and toggle off the ‘Contact joined Signal.’ The steps are similar for the iOS version too. In India it is estimated that the Signal a...