First click on the photo album "Photos" of Apple's mobile phone, as shown below.

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Click "View All", as shown in the figure below.

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Enter the photo album and find the photo you want to delete, as shown in the figure below.

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Click "Select" in the upper right corner, as shown in the figure below.

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Then slide the screen with your finger to select multiple photos, as shown in the figure below.

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Finally, click Delete in the lower right corner, as shown in the figure below.

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