Your iPhone 6 automatically corrects words without warning as you type, if the Auto-Correction feature is turned on. At times, the phone may correct words you deliberately misspell or even words that are correct, so the feature may become annoying. Instead of turning off the feature in iOS 8 or proofing each text message or email, turn on the Speak Auto-text feature to have the iPhone warn you when it corrects a word.
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Turn up the volume on your iPhone 6 by pressing the "Volume Up" button on the left side of the phone. If the volume is too low, you may not hear the corrections.
Return to the home screen and then launch the Settings app by tapping the "Settings" icon. Tap "General," then "Keyboard" to view all settings related to keyboards, and then turn on the "Auto-Correction" option. Obviously, the phone doesn't speak corrections unless this option is enabled.
Return to the General section of the Settings app, tap "Accessibility" and then "Speech." Turn on the "Speak Auto-text" option to have the iPhone 6 speak corrections. Press the "Home" button to return to the home screen.
Launch an app such as Messages or Mail and start typing some words, making deliberate mistakes to test the new settings. Adjust the volume until you hear the corrections clearly.