Sony SGPT21 - Manual (Page 70)

Using the On-screen Keyboard
The on-screen keyboard changes each time you tap the two keys below the left-side [Tab] key.
Hint
Bars on these keys show the status of current keyboard. When you tap the keys, the bars also change.
To set the input language
Tap [ Apps] - [ Settings] - [ Language & input] - [Configure input methods] in that order. Under
[Standard keyboard], tap [Settings] then [Input languages] and then put a check mark on the languages to use.
To switch the input language
When you select multiple languages to use for input, you can switch languages by tapping the language switching
key at the bottom left of the on-screen keyboard.