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. This update includes over 100 fixes and optimizations to the mobile and desktop apps – eliminating bugs, improving speed, and expanding minor features. iOS users with the latest iPhones and iPads get significantly smoother animations (120 FPS) throughout the app. Android users will notice better audio and video quality in voice and video messages, along with options to set alternative app icons, clear all recent stickers at once and translate user bios or chat descriptions. Owners of public groups can enable join requests via Group Info > Edit > Group Type > Who Can Send Messages > select Only Members > enable Approve New Members.
If you prefer keeping the sensitive content of your chats limited to yourself and avoiding it from being intercepted by a hacker or the authorities in your country or region, this Telegram trick is for you. While normal chats in Telegram are user-to-server encrypted and cannot be read unless someone breaches Telegram’s servers, Secret Chats take it to a new level by providing user-to-user encryption. These chats are meant to be short-lived and not stored on Telegram’s servers. The company also makes its API publicly available for free and invites developers to create clients on other platforms. Users can also create custom bots, themes, stickers, and more free of charge. The cool features of Telegram aren't all so serious, though. Check out how to make your own Telegram stickers if emojis aren't enough. Terminate old sessions
Lock Your Conversations Customize Telegram App Icon Automatic Saving to Gallery on Android Edit Sent Messages
You can take a new photo, upload an existing one, search the web for a new image, or remove your current photo. Bots that are integrated into the Attach attachment menu can now also work in groups and channels in addition to one-on-one chats.
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