Here's how you can turn on Speak Selection on your iPhone. This will let Siri read text aloud to you. Siri can read Word documents or PDF text, plus text on the Notes app.
1. Go to Settings.
2. Go to General.
3. Go to Accessibility.
4. Go to Speak Selection.
5. Toggle the Speak Selection option to the On position.
Now just go to your document and select the text you want to have read to you, or select all of it. Tap on Speak in the menu, and Siri will read your text to you.
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