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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. Telegram supports two layers of secure encryption. Cloud Chats use server-client encryption while Secret Chats use an additional layer of client-client encryption. All content is encrypted in the same way — be it media, text, or files. Users

Large file size limit Telegram offers plenty of options for customization to make the app feel like a truly personal experience. Here is the list of interface element you can change: When sending large files shared from another app on iOS, you can now watch an animated progress bar to find out if you have enough time for a tea or if you should stick with espresso. Auto-download and Auto-play Media

Now tap on Notifications and mute the contact for either a custom period of time or forever. I generally leave it for forever. See also: How to delete a Telegram account Polls and Quiz Mode Now, tap If Inactive For at the bottom of the screen and choose a preferred option like 1 week or 1 month in the popup menu.

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