For many languages, iPhone uses the active dictionary to correct misspellings or make suggestions as you type. When iPhone suggests a word, you can accept the suggestion without interrupting your typing. For a list of supported languages, see www.apple.com/iphone/specs.html.
Accept the suggestion: Type a space, punctuation mark, or return character.
Reject a suggestion: Tap the “x” next to the suggestion.
Each time you reject a suggestion for the same word, iPhone becomes more likely to accept the word.
iPhone may also underline words you’ve already typed that might be misspelled.
Replace a misspelled word: Tap the underlined word, then tap the correct spelling. If the word you want doesn’t appear, just retype it.
Turn auto-correction or spell checking on or off: Go to Settings > General > Keyboard.