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To lock a chat go to Settings->Privacy and Security->Passcode Lock and enable it. Once you create a passcode and enable it, you will be able to lock and unlock your chats by tapping on the lock icon at the top right of the app. Save to Gallery Settings on Android Premium 4 GB Uploads

Global message deletion For times when you may wish to concentrate on your work or just want to keep alerts from certain Telegram chats away to prevent them from becoming distractions, you can choose to mute chats. Yeah, this is exactly what you should use to reign in the annoying chats that keep bombarding you with unnecessary messaging. Depending on your needs, you can choose to mute individual chats for specific time durations like for 1 hour, 8 hours, 1 day, 7 days, or mute until a preferred date and time. The Telegram icon on an Honor View 20 on a flowery pillow. Private Chats in Telegram Settings

Public figures and organizations can verify their group, channel or bot – receiving a verification badge Verification Check to show users that messages are coming from a confirmed source. In addition to profiles, search results and the chat list, these badges now appear at the top of the chat. This makes it even easier to identify verified sources of information. If you’re using Telegram with the calls, secret chats feature, which provides end-to-end encryption for your messages, You can also be locking down the app itself with a passcode, PIN, or password automatically. To create your own theme, tap the three-dot button (Android) or go to Chat Themes (iOS) and choose Create new theme. Here, you can create your own look if you don't like any of the default options. Share Live Location 1b

If you do not want this to happen and want Telegram to keep running in the background to send you notifications in real-time, you can head over to Settings/ Notifications and Sounds/ Keep Alive Service and turn it on. Launch the Telegram app on your iPhone or Android device -> navigate to the Settings and choose Devices.