Voiceover is a screen reader that you can use with IOS products. This feature has been added to the operating system of Apple devices to improve accessibility for users with visual impairment.
Using VoiceOver on iPhone
Go to the Settings app. Tap General> Accessibility> VoiceOver. Turn the switch next to the feature to the ‘On’ position.
Or you can turn on Voiceover by using Siri. To do this, you can long-press the home screen button of your phone and say; “Turn on voiceover”.
Please find a detailed article on voiceover gestures here.
You can also find detailed video instructions by clicking this link: