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Telegram is more secure than mass market messengers like WhatsApp and Line. We are based on the MTProto protocol (see description and advanced FAQ), built upon time-tested algorithms to make security compatible with high speed delivery and reliability on weak connections. We are continuously working with the community to improve the security of our protocol and clients
The Telegram FAQ is here:
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Here is a summary of what makes Telegram an attractive option for instant messaging:
Free of charge and run by a non-profit organization
Fast
Open (open API, open protocol, open source clients; the server side is currently closed though)
Accepts file uploads up to 1.5 GB
Secret Chats (end-to-end encryption, a timer to destruct messages)
Bot API (API that lets you write your own bots to notify you or deliver content to your Telegram client).
This little bit here is on options to join:
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Telegram accounts are tied to the phone number of the user. The easiest way to start with Telegram are the mobile apps, because they can scan your contacts and give you a list of friends already using the service. You can join Telegram even without having a smartphone, though. You can create an account in one of the official clients including the web client. You’ll need a phone to receive authentication PINs via SMS