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The navigation drawer is a UI panel that shows your app's main navigation menu. It is hidden when not in use, but appears when the user swipes a finger from the left edge of the screen or, when at the top level of the app, the user touches the drawer icon in the app bar.

After the Intro, users arrive on the login page, where they are invited to enter their mobile phone number and country code — either manually or by selecting their country from a list. You can get a list of countries and codes on countrycode.org or simply exctract it from the source code of other Telegram apps.