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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. Private Chats in Telegram Settings delete sender's message

You don’t have to start from scratch to make Telegram apps. TDLib (Telegram Database Library) makes it easy to develop feature-rich and secure apps. It takes care of local data storage, network implementation details, and encryption so that you can focus on design and interfaces. On iOS, Telegram offers you the flexibility to choose a default browser where the links are opened. Though Safari is set as the default option, you can set other browsers like Chrome, Firefox, or Microsoft Edge as the preferred choice. Telegram also has an auto-night mode that you can use to save your eyes at night! System Default (Android) or System (iOS): Matches the theme to your operating system's current mode.

Change Phone Numbers 2b A further privacy blunder is that Telegram notifies your contacts when you join it — unless you don’t give it permission to access your contacts. The app doesn’t warn you it’s about to ping your contacts, and that’s a big caveat for those who want to use Telegram to keep a low profile. Telegram Cloud That’s far from saying Telegram will protect you from all privacy terrors the online world presents — you should check out our Android privacy guide for a broader look at that. Telegram just offers a good marriage of popularity and security for those with concerns over other messaging apps.

Locate users near you Unlike mass-market messengers like WhatsApp and Line, Telegram is an open-source app. This means anyone can check the app’s source code, protocol, API, and see how it works and make an informed decision.