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Android - Display the on-screen keyboard

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.