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If not, touch Samsung keyboard to enable it. Click here for steps on turning off predictive text in the Swype keyboard. When you're typing text, touch Settings to change the Samsung keyboard settings. If you're using a keyboard other than the Samsung keyboard, such as Swype, changing your Samsung keyboard settings will have no effect. Swype also uses predictive text. The Samsung Galaxy S3 will no longer suggest words as you type.

Summary:
Touch the Menu button. Touch Settings. Touch My device. Scroll down until you see the Personal section, and then touch Language and Input. Make sure Samsung keyboard is selected. Next to Samsung keyboard, touch the gear button. To the right of Predictive text, slide the toggle to OFF to disable predictive text.