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Enable Auto-Night Mode To lock your messages, go to “Settings”, “Privacy and Security” and tap on “Passcode Lock”. You will be asked to set a four-digit passcode and confirm it. Once you do that, you will find additional options to “unlock the app with fingerprint” and “auto-lock” it after a specific duration. If your device is stolen or someone took it, and you don’t want him/her to see the messages in your chat window, then you can simply terminate all the active sessions with just one click using your Mac, Desktop, Linux or Web client.

Telegram allows edit, unsend sent messages even for the other people on the same chat. It allows to unsend messages shared with the first 48 hours after sending. One of the things that I love about Telegram is that the service gives me an easy way to change my phone number attached to my account without making me lose all my previous chats. If you also want to switch your Telegram number, it’s pretty easy to do. First, tap on Settings and then tap on your mobile number. Telegram offers a few other handy options in chats. You can delete any message by long-pressing it, then hitting the Trash icon that appears. The app lets you delete messages at any time—even messages that the other person sent in a chat. Open a Telegram chat

Request to join a public group Under the Other section, tap Open Links in and then choose a preferred browser from the list. Customize Telegram App Icons Secret chats

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