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You can set a password that will be required when you log in on a new device in addition to the code you get in the SMS.
Using less data may improve your experience on bad networks, but will slightly decrease audio quality.
Note that you can seamlessly use Telegram on all your devices at once.
Remember, logging out kills all your Secret Chats.
Experimental feature, use with caution. Encrypt your local Telegram data, using a derivative of your passcode as the key.