Head over to Settings > General > Accessibility > Speech. Then turn on Speak Screen and Speak Selection. Now, when you swipe down from from the top of the screen with two fingers, Siri will dictate the content of whatever is on the screen.
How do you get Siri to talk out loud?
Change Siri's volume on your iPhone You can ask Siri to change your volume settings. Just say "Hey Siri, speak louder" or "Hey Siri, speak quieter." If you want to change the volume when Siri is speaking or when you're using headphones, press the Volume buttons on the side of your iPhone.23 Sept 2021