Article: Here you will also find settings that can make it easier to hear audio, increase the contrast between light and dark colors, or add subtitles to supported videos.  This will enable your device to speak selected text. This will enable your device to speak text on the screen. If you'd prefer to have your text read back to you in different accents and/or languages. Tap the "Voices" option to choose. Note: Adding different voices will download files to your phone. Some voice files, such as Alex, can take up a significant amount of space. The speaking rate controls how fast the words are read back to you. Move the slider towards the rabbit for quicker speech, or towards the turtle for slower speech. You can have your device highlight words as they're read by toggling this option on.
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Open the "Settings" app. Tap "General". Tap "Accessibility". Tap "Speech". Toggle "Speak Selection" ON. Toggle "Speak Screen" ON (iOS 8 and later). Select a voice (optional). Change the speaking rate using the slider. Toggle text highlighting on or off (optional).