Telegram is a messaging app with a focus on speed and security, it’s super-fast, simple and free. You can use Telegram on all your devices at the same time — your messages sync seamlessly across any number of your phones, tablets or computers.
Telegram Login Widget for external websites is here. When you use Telegram login for the first time, the widget asks for your phone number and sends you a confirmation message via Telegram to authorize your browser. Once this is done, you get a two-click login on every website that supports signing in with Telegram.