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. Then choose Change Number and follow the instructions. This will move all messages, clients, and media to your new mobile number. Plus, Telegram will automatically add your new number in the address books of all your contacts. You can surely delete messages that you have sent, but did you know that Telegram has brought a new feature that lets you delete messages sent by other users too. That’s kind of weird, but this feature is for users who prioritize privacy over everything. To use this feature, just select the received message and tap on the “delete” button. Now, select “Also delete for X” and tap on “Delete”. The message will disappear from both ends without leaving any trace.
Hopefully, I have listed enough Telegram features to help you understand why the Telegram app is so popular and secure. {} Self-destruct is a popular feature on Telegram, but it has been limited to the separate “Secret Chat” option only. However, with the recent update, now you can self-destruct media like photos and videos on normal chats too. Just select a photo or video and then tap on the “timer” button. Now, you can choose the time after which the media will be deleted from everywhere. You’ll have to be especially concerned with privacy to want to do this — it means you’ll never have a chat log — nonetheless, it’s a nice option that Facebook Messenger, WhatsApp, and WeChat don’t have.
If you select the Scheduled option, the auto-night mode will kick in at a pre-defined time which you can change. If you select the Automatic mode, the auto-night mode will start depending on the ambient light. You can slide the slider to select at what percentage of the ambient lighting do you want the night mode to start at. Personally, I prefer the scheduling option, however, you can use the one you like. Because Telegram lets you interact with people even if you aren't in each other's contacts, you may wish to make your account more private. To change privacy options, head to Settings > Privacy and Security. Here, you can change who can see your phone number, active status, and more. Polls Customize the Look of Telegram
With Telegram, you can send thousands of high-quality stickers right from the chatbox. Just tap the “sticker icon” on the left bottom, and it will show you dozens of trending stickers and masks. You can search for specific stickers and add them to your virtual keypad. Secret chats
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