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Telegram is all about privacy and security, and it isn't beholden to larger companies like Facebook. The company also makes its API publicly available for free and invites developers to create clients on other platforms. Users can also create custom bots, themes, stickers, and more free of charge. To use a proxy server in Telegram, open Settings > Data and Storage > Proxy Settings. Enable Use Proxy and you'll need to fill in all the required information to add it. You can find server info for this online if needed.

Bot API: lets you build programs that use Telegram messages for an interface. You don’t need to have knowledge of MTProto encryption protocol. The intermediary server will handle all communication and encryption with Telegram API for you. Auto-download and Auto-play Media Change Default browser in Telegram Custom Theme Your Telegram 1b Telegram Messenger Tricks

The encryption is based on 2048-bit RSA encryption, 256-bit symmetric AES encryption, and Diffie–Hellman secure key exchange. Speaking of multiples, Telegram allows you to upload additional profile photos. While the latest photo is the profile picture your contacts will see, they can swipe to see the rest of your pictures. Read also: WhatsApp vs Telegram vs Signal: Which messaging app should you use? Appearance section in Telegram

However, with new Telegram updates, they provide two-step verification for your telegram account. That means if you want to login to telegram on another device, it’s required your two-step password to log in. You can also set up it from the Privacy and Security list as I mentioned above. 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.