The feature is designed to correct common misspellings but may fail to recognize proper nouns, colloquialisms and technical or scientific terms. If predictive text inserts errors into your emails or text messages, you can turn off the feature from the Settings menu.
Disable Word Prediction in iOS
Touch “Settings” on the Home or Apps screen and then tap “General.” Scroll to the bottom of the page and tap “Keyboard.”
Toggle the Auto-Correction option to “Off.” To prevent iOS from automatically capitalizing characters as well, toggle Auto-Capitalization to “Off.”
Disable Predictive Text on Android
Press the “Menu” key from the Home screen and then touch “Settings.” Select “Android Keyboard Settings” from under Input Options and then touch “Auto Correction.” Choose “Off” from the menu to disable predictive text.
Disable Predictive Text on BlackBerry Devices
Swipe down from the top of the Home screen to open the Settings panel. Touch “Language and Input.” Select “Portrait Mode” and choose “Off” from the drop-down menu. Select “Landscape Mode” and then choose “Off” from the drop-down menu to disable predictive text completely.