Telegram is a messaging application for mobile and web. This app offers an Android SDK to create mobile applications that can send private messages with encrypted messages, access messages of any size, and build with an open API. To build a mobile application, a redirected GitHub link offers a guide with three steps. The instructions show how to obtain an api_id, study security guidelines, publish code to comply with licenses, and run the project. As the site mentions, with Telegram Android SDK developers can build secure, powerful, and distributed apps.