The iPhone's Auto-Correction feature suggests and automatically applies suggested words as you type. However, not all misspellings are errors; the words -- such as some proper names, acronyms or scientific terms -- may simply not exist in the default dictionary. By rejecting the iPhone's suggested word, you add the word you originally typed to your personal dictionary. If you accidentally accept an actual misspelling, it could crop up again in text messages without being corrected, because you've instructed your iPhone to accept it. Reset the keyboard dictionary to return to the default dictionary and erase these false entries.
Press the "Home" button, and then tap "Settings."
Tap "General," and then "Reset."
Tap "Reset Keyboard Dictionary," and then select "Reset Dictionary" from the confirmation dialog.
Information in this article applies to iPhones running iOS 7. It may vary slightly or significantly with other versions or products.
Although you can't delete the default dictionary, you can turn off the Auto-Correction feature to stop your iPhone from using the dictionary. Tap "Settings," select "General," tap "Keyboard," and then tap and drag the Auto-Correction slider to the left until the green switch turns white, indicating it's disabled.
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