You can select a number of settings when keying in text.
The following steps show you how to change writing language, turn on word suggestion and write text.

Slide two fingers down the display starting from the top edge of your mobile phone.
Tap Settings.

Tap Language & input.

Tap the settings icon next to "Xperia™ keyboard".

Tap Writing languages.

Tap the required language until it's selected.

Tap OK.

Tap Word suggestions.

Tap I never want to have any words or letters replaced.

Tap the home icon to return to the home screen.

The following steps require that you're writing text and that the keypad is visible.

Tap the letter keys to write the required word.
A number of words based on the letters you've keyed in are displayed.

Tap the required word to insert it.

Tap 12!?.

Tap the required numbers or the required symbols.

Tap +=$ to see more symbols.

Tap Abc to return to text input.