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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. In order to protect your personal information, Telegram automatically terminates your old sessions after 6 months. However, you can choose to get rid of the old sessions sooner in order to further boost security. Create APIs

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Have you ever needed to change your phone number but worried about transferring all your contacts and other information to the new number? While this can be a lot of work, Telegram does it all for you. You can easily change the phone number attached to your account without losing any of your chats or contacts. To adjust the theme, go to Settings > Chat Settings on Android, or Settings > Appearance on iOS. Here you can change the text size, bubble colors, night mode settings, and similar options. Choose Chat Background to set a new wallpaper for your groups. Search Friends by Username Clear Telegram Cache and Local Database

Telegram is a free instant-app service founded by people behind VK, which is Russia’s biggest social networking site, primarily focused on speed and user privacy. Initially released in August 2013, the app has managed to get over 400 million monthly active users. Mute Specific Telegram Chats