It may happen that the onscreen keyboard of your Android device does not appear automatically. Still it will appear at the bottom of the screen when you tap on a text for editing.
In a text field (email or a message):simply press tap on text box to display the keyboard.
From an app: Holding down the menu key for a couple of seconds will also display the keyboard. Still, if the application does not require the use of the keyboard, the latter won't be displayed.
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