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Maybe the best alternative to Whatsapp with your personal data protection, secret chats, bots and channels!
Telegram for Android is a messenger for Android devices, with which you can send messages and files in a variety of formats. Telegram's private correspondence is protected by a special encryption system - the creators of the service claim that they have no access to users' messages and do not use their information for advertising purposes. The messenger also allows microblogging and the use of bots.
Instant messenger: Telegram lets you send instant messages, voice messages and even video messages, as well as photos, large files and documents.
Security: Telegram offers secret chats with direct peer-to-peer communication, without going through the Telegram servers and also with message self-destruct function, depending on the security that the participants want to impose.
Privacy: Telegram doesn’t share your personal data with third parties protecting your privacy.
Cross-platform: Telegram is a multi-platform messenger, allowing you to use free cloud storage, so the content of your messages and files can be accessed from any of your computers and multiple mobile devices.
Encryption: everything you send by Telegram, including chats, groups, media, etc. is encrypted using a combination of 256-bit symmetric AES encryption, 2048-bit RSA encryption, and Diffie–Hellman secure key exchange.