Go to "Settings," then hit "Accessibility." Click "Display and Text Size." Go down to "Color Filters," and toggle the slider so it is on. You can choose between "Grayscale," "Red/Green Filter," "Green ...
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How to personalize your iPhone lock screen
The iPhone’s lock screen isn’t just the place you check the time or your notifications anymore — it’s a fully customizable space where you can express your personality, highlight your favorite photos ...
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