The iPhone X has the same amount of speaker holes on each side of the lightning port at the bottom and the XS has 3 on one side and 6 or 7 on the other side. That’s really the only way to tell them apart. - iPhone X
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iPhone XS Max Battery Replacement and Reassembly!
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iPhone X Teardown - iFixit
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iPhone - Wikipedia
iFixit tears down the iPhone 12 Pro Max, showcasing new camera
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