All of Telegram's official components are open source, with the exception of the server which is closed-sourced and proprietary. There are also two official Telegram web twin apps, WebK and WebZ, and numerous unofficial clients that make use of Telegram's protocol. Various client apps are available for desktop and mobile platforms including official apps for Android, iOS, Windows, macOS and Linux (although registration requires an iOS or Android device and a working phone number).
The servers of Telegram are distributed worldwide with five data centers in different regions, while the operational center is based in Dubai, United Arab Emirates. It was launched for iOS on 14 August 2013 and Android on 20 October 2013. The service also provides optional end-to-end encrypted chats and video calling, VoIP, file sharing and several other features. Telegram is a globally accessible freemium, cross-platform, cloud-based instant messaging (IM) service.
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