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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. If you do not want this to happen and want Telegram to keep running in the background to send you notifications in real-time, you can head over to Settings/ Notifications and Sounds/ Keep Alive Service and turn it on. Locate users near you

Telegram offers two types of APIs for developers. Both are free of charge. Telegram is kind of a big deal for me. Self-destruct Media in Normal Chats Send Uncompressed Media without Changing the File Extension

Open Telegram app -> Settings -> Privacy and Security. 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. While all Telegram chats are client-server encrypted, default chats are still stored on Telegram's servers. This conveniently allows you to access your messages on multiple devices, but it might raise privacy concerns. In spite of this whooping figure, Telegram is way behind the world’s most popular messaging service, Whatsapp. However, it has all the potential to get over a billion active users.

Bots that are integrated into the Attach attachment menu can now also work in groups and channels in addition to one-on-one chats. To edit photos/videos, click on the “attach file” and select a file from the gallery, or capture a new one from the camera. Once you do that, you will see various options to edit the file before sending it. You can crop the picture, adjust colors, exposure, contrast, and add emojis and text to videos.