Here are the most likely reasons Apple skipped the iPhone 9 and jumped straight from iPhone 8 to iPhone X.
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Apple Skips iPhone 9, Confusing Internet
Why there is no iPhone 9 Why apple skipped the iPhone 9
Why Apple Skipped The iPhone 9
Why is the iPhone 9 not launched? - Quora
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Likely Reasons Why There Is No iPhone 9 - The Tech Edvocate
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3 Likely Reasons Why There Is No iPhone 9