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. You'll have four options to choose from: App Customizing Options and Themes
Mute Specific Telegram Chats There’s no denying the fact that Telegram became as popular as it is because of its focus on privacy. The service not only provides end-to-end encryption on the server-side of the things but also allows users to lock their chats. This is great for safeguarding your personal chats when you are handing out your device to anyone else. Digital Stickers allow you to express yourself better and in a more fun way. Since they are bigger, more detailed, and frequency animated, they make up for the expressiveness and gesture that can get lost in text conversations. Premium Faster Downloads
Verification Badges in Chats Customize Theme and Message Corners Premium subscribers are able to download media and files at the fastest possible speed. You can access everything in your unlimited cloud storage as fast as your network can keep up. Telegram is one of the feature-packed messaging services out there, armed with some neat perks that can put rivals like WhatsApp and Signal to shame when it comes to functionality. While basic Telegram features like the ability to edit messages after sending them are well known, here are some lesser-known, yet incredibly useful things the app can do that could come in quite handy.
Another security feature that adds usability is usernames. Instead of giving people your phone number, you can simply give them your username. This gives you better control over what information is out there, and how people can contact you in the future. Read More On This Topic
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