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. To use this feature, head over to the hamburger menu by swiping right and choose Contacts. Choose ‘Find People Nearby’ and here you will see a list of contacts who have chosen to be visible. You can also scroll down to see all nearby groups and the option to create your own. Users who wish to be discovered by this feature can turn it on in the hamburger menu/People Nearby/Make myself visible. Can Telegram be used on PC?
To change the number you use with Telegram, open Settings (which is inside the left menu on Android). On iPhone, in the next menu, tap Edit in the top-right corner. This step isn't necessary on Android. How often have you sent a message to a colleague or friend and then realized it is filled with typos? With Telegram, you can quickly make it right with its edit feature. And now you have your own newly themed Telegram. There are so many themes on the Android Themes channel that you can change them daily and still won’t run out of them in years, so enjoy!! You'll have four options to choose from:
Secret Chats There are many astonishing features that set Telegram messenger apart from other messaging services. For instance, you can coordinate groups of up to 200,000 members, send documents of any type, destruct your messages with a timer, or even build your own tools on their API. If you don’t want to go through the hassle of customizing your own theme and still want to theme your Telegram, you can do that too. To do that, tap on the search icon and search for the word Themes. In the results, tap on Android Themes Channel. The channel houses the list of all the themes that people create and share. Just scroll to find the one you like. Once you find a theme that you like, tap on the download icon. Once it’s downloaded, tap on it again and then tap on the Apply button. Telegram Attachment Options
The encryption is based on 2048-bit RSA encryption, 256-bit symmetric AES encryption, and Diffie–Hellman secure key exchange. Stories and statuses
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